Convert to "container-based" travis build (#2449)
Convert to "container-based" travis build (#2449)

* Convert to "container-based" travis build

Since all ppa sources used are currently whitelisted by Travis, why don't we convert to a "sudo-less" structure that promises a shorter build start time?

* Explicitly disable sudo in Travis

narabo/mastodon,hugogameiro/mastodon,gol-cha/mastodon,MitarashiDango/mastodon,kazh98/social.arnip.org,haleyashleypraesent/ProjectPrionosuchus,im-in-space/mastodon,5thfloor/ichiji-social,pfm-eyesightjp/mastodon,Ryanaka/mastodon,im-in-space/mastodon,tateisu/mastodon,thnkrs/mastodon,increments/mastodon,pixiv/mastodon,mstdn-jp/mastodon,unarist/mastodon,TheInventrix/mastodon,glitch-soc/mastodon,YuyaYokosuka/mastodon_animeclub,Monappy/mastodon,Arukas/mastodon,Nyoho/mastodon,corzntin/mastodon,MastodonCloud/mastodon,rainyday/mastodon,abcang/mastodon,abcang/mastodon,kazh98/social.arnip.org,koteitan/googoldon,Kyon0000/mastodon,Arukas/mastodon,masarakki/mastodon,theoria24/mastodon,robotstart/mastodon,codl/mastodon,3846masa/mastodon,hugogameiro/mastodon,pfm-eyesightjp/mastodon,TheInventrix/mastodon,haleyashleypraesent/ProjectPrionosuchus,increments/mastodon,WitchesTown/mastodon,salvadorpla/mastodon,d6rkaiz/mastodon,amazedkoumei/mastodon,Nyoho/mastodon,NS-Kazuki/mastodon,Chronister/mastodon,kazh98/social.arnip.org,SerCom-KC/mastodon,ambition-vietnam/mastodon,yukimochi/mastodon,ambition-vietnam/mastodon,lindwurm/mastodon,blackle/mastodon,h3zjp/mastodon,hugogameiro/mastodon,danhunsaker/mastodon,pso2club/mastodon,pointlessone/mastodon,theoria24/mastodon,Arukas/mastodon,koteitan/googoldon,vahnj/mastodon,ms2sato/mastodon,3846masa/mastodon,MitarashiDango/mastodon,pfm-eyesightjp/mastodon,ms2sato/mastodon,kirakiratter/mastodon,hyuki0000/mastodon,HogeTatu/mastodon,kirakiratter/mastodon,dwango/mastodon,yukimochi/mastodon,robotstart/mastodon,gol-cha/mastodon,maa123/mastodon,ebihara99999/mastodon,maa123/mastodon,masto-donte-com-br/mastodon,pinfort/mastodon,MitarashiDango/mastodon,salvadorpla/mastodon,amazedkoumei/mastodon,narabo/mastodon,yukimochi/mastodon,masto-donte-com-br/mastodon,ikuradon/mastodon,rekif/mastodon,sylph-sin-tyaku/mastodon,mhffdq/mastodon,Kyon0000/mastodon,yi0713/mastodon,dunn/mastodon,tootcafe/mastodon,summoners-riftodon/mastodon,mosaxiv/mastodon,vahnj/mastodon,imomix/mastodon,Toootim/mastodon,Monappy/mastodon,sylph-sin-tyaku/mastodon,ikuradon/mastodon,summoners-riftodon/mastodon,sinsoku/mastodon,imomix/mastodon,TootCat/mastodon,HogeTatu/mastodon,kagucho/mastodon,dunn/mastodon,rekif/mastodon,corzntin/mastodon,cybrespace/mastodon,kagucho/mastodon,developer-mstdn18/mstdn18,kazh98/social.arnip.org,Nyoho/mastodon,cobodo/mastodon,dunn/mastodon,dwango/mastodon,lindwurm/mastodon,tootsuite/mastodon,tootsuite/mastodon,mhffdq/mastodon,esetomo/mastodon,KnzkDev/mastodon,yi0713/mastodon,Kirishima21/mastodon,anon5r/mastonon,cobodo/mastodon,danhunsaker/mastodon,clworld/mastodon,RobertRence/Mastodon,pso2club/mastodon,riku6460/chikuwagoddon,h3zjp/mastodon,pinfort/mastodon,lynlynlynx/mastodon,SerCom-KC/mastodon,masto-donte-com-br/mastodon,ambition-vietnam/mastodon,kagucho/mastodon,SerCom-KC/mastodon,sylph-sin-tyaku/mastodon,moeism/mastodon,tri-star/mastodon,lindwurm/mastodon,imomix/mastodon,glitch-soc/mastodon,thor-the-norseman/mastodon,h-izumi/mastodon,Craftodon/Craftodon,Kirishima21/mastodon,Chronister/mastodon,PlantsNetwork/mastodon,YuyaYokosuka/mastodon_animeclub,RobertRence/Mastodon,unarist/mastodon,blackle/mastodon,RobertRence/Mastodon,Nyoho/mastodon,Craftodon/Craftodon,glitch-soc/mastodon,saggel/mastodon,5thfloor/ichiji-social,PlantsNetwork/mastodon,mosaxiv/mastodon,masarakki/mastodon,Ryanaka/mastodon,pso2club/mastodon,yi0713/mastodon,yukimochi/mastodon,narabo/mastodon,thor-the-norseman/mastodon,robotstart/mastodon,TheInventrix/mastodon,amazedkoumei/mastodon,alarky/mastodon,res-ac/mstdn.res.ac,imomix/mastodon,ykzts/mastodon,imas/mastodon,honpya/taketodon,gol-cha/mastodon,Toootim/mastodon,WitchesTown/mastodon,mosaxiv/mastodon,lindwurm/mastodon,corzntin/mastodon,pixiv/mastodon,ebihara99999/mastodon,d6rkaiz/mastodon,foozmeat/mastodon,dwango/mastodon,rutan/mastodon,h3zjp/mastodon,honpya/taketodon,primenumber/mastodon,abcang/mastodon,Kirishima21/mastodon,mimumemo/mastodon,mecab/mastodon,mimumemo/mastodon,Monappy/mastodon,dunn/mastodon,koba-lab/mastodon,NS-Kazuki/mastodon,honpya/taketodon,MastodonCloud/mastodon,rainyday/mastodon,pixiv/mastodon,MastodonCloud/mastodon,ebihara99999/mastodon,codl/mastodon,hyuki0000/mastodon,musashino205/mastodon,dwango/mastodon,musashino205/mastodon,sinsoku/mastodon,summoners-riftodon/mastodon,im-in-space/mastodon,Arukas/mastodon,mecab/mastodon,cobodo/mastodon,h3zjp/mastodon,increments/mastodon,alarky/mastodon,imas/mastodon,d6rkaiz/mastodon,nonoz/mastodon,maa123/mastodon,tootcafe/mastodon,havicon/mastodon,blackle/mastodon,gol-cha/mastodon,KnzkDev/mastodon,KnzkDev/mastodon,clworld/mastodon,res-ac/mstdn.res.ac,8796n/mastodon,TheInventrix/mastodon,h-izumi/mastodon,koteitan/googoldon,PlantsNetwork/mastodon,rutan/mastodon,ykzts/mastodon,Toootim/mastodon,lynlynlynx/mastodon,rekif/mastodon,musashino205/mastodon,mstdn-jp/mastodon,glitch-soc/mastodon,saggel/mastodon,TootCat/mastodon,KnzkDev/mastodon,Toootim/mastodon,tateisu/mastodon,h-izumi/mastodon,blackle/mastodon,palon7/mastodon,vahnj/mastodon,Chronister/mastodon,mimumemo/mastodon,koba-lab/mastodon,mecab/mastodon,sylph-sin-tyaku/mastodon,primenumber/mastodon,rutan/mastodon,unarist/mastodon,Kirishima21/mastodon,8796n/mastodon,kirakiratter/mastodon,RobertRence/Mastodon,3846masa/mastodon,ykzts/mastodon,clworld/mastodon,5thfloor/ichiji-social,NS-Kazuki/mastodon,vahnj/mastodon,vahnj/mastodon,theoria24/mastodon,ms2sato/mastodon,ambition-vietnam/mastodon,alarky/mastodon,palon7/mastodon,verniy6462/mastodon,mstdn-jp/mastodon,3846masa/mastodon,palon7/mastodon,honpya/taketodon,thnkrs/mastodon,moeism/mastodon,palon7/mastodon,nonoz/mastodon,foozmeat/mastodon,mhffdq/mastodon,haleyashleypraesent/ProjectPrionosuchus,tri-star/mastodon,WitchesTown/mastodon,havicon/mastodon,pointlessone/mastodon,ykzts/mastodon,pinfort/mastodon,saggel/mastodon,cobodo/mastodon,developer-mstdn18/mstdn18,koteitan/googoldon,esetomo/mastodon,Ryanaka/mastodon,developer-mstdn18/mstdn18,hugogameiro/mastodon,Craftodon/Craftodon,TootCat/mastodon,esetomo/mastodon,thnkrs/mastodon,ikuradon/mastodon,mimumemo/mastodon,increments/mastodon,NS-Kazuki/mastodon,theoria24/mastodon,tri-star/mastodon,pfm-eyesightjp/mastodon,salvadorpla/mastodon,haleyashleypraesent/ProjectPrionosuchus,amazedkoumei/mastodon,cybrespace/mastodon,musashino205/mastodon,tootsuite/mastodon,pointlessone/mastodon,masto-donte-com-br/mastodon,d6rkaiz/mastodon,maa123/mastodon,tateisu/mastodon,imas/mastodon,danhunsaker/mastodon,im-in-space/mastodon,rainyday/mastodon,moeism/mastodon,nonoz/mastodon,h-izumi/mastodon,pinfort/mastodon,primenumber/mastodon,riku6460/chikuwagoddon,primenumber/mastodon,codl/mastodon,salvadorpla/mastodon,rekif/mastodon,pso2club/mastodon,tootcafe/mastodon,alarky/mastodon,res-ac/mstdn.res.ac,foozmeat/mastodon,codl/mastodon,hyuki0000/mastodon,anon5r/mastonon,lynlynlynx/mastodon,yi0713/mastodon,clworld/mastodon,5thfloor/ichiji-social,rainyday/mastodon,SerCom-KC/mastodon,havicon/mastodon,Kyon0000/mastodon,verniy6462/mastodon,masarakki/mastodon,HogeTatu/mastodon,foozmeat/mastodon,summoners-riftodon/mastodon,esetomo/mastodon,verniy6462/mastodon,anon5r/mastonon,imas/mastodon,rutan/mastodon,WitchesTown/mastodon,corzntin/mastodon,ebihara99999/mastodon,pointlessone/mastodon,PlantsNetwork/mastodon,8796n/mastodon,tootsuite/mastodon,kagucho/mastodon,thor-the-norseman/mastodon,koba-lab/mastodon,Craftodon/Craftodon,riku6460/chikuwagoddon,hyuki0000/mastodon,unarist/mastodon,sinsoku/mastodon,tootcafe/mastodon,mecab/mastodon,Chronister/mastodon,cybrespace/mastodon,YuyaYokosuka/mastodon_animeclub,koba-lab/mastodon,tateisu/mastodon,Ryanaka/mastodon,kirakiratter/mastodon,MitarashiDango/mastodon,narabo/mastodon,tri-star/mastodon,nonoz/mastodon,masarakki/mastodon,anon5r/mastonon,riku6460/chikuwagoddon,mosaxiv/mastodon,mhffdq/mastodon,Monappy/mastodon,danhunsaker/mastodon,res-ac/mstdn.res.ac,mstdn-jp/mastodon,YuyaYokosuka/mastodon_animeclub,TootCat/mastodon,lynlynlynx/mastodon,verniy6462/mastodon,MastodonCloud/mastodon,ikuradon/mastodon,abcang/mastodon,cybrespace/mastodon,TheInventrix/mastodon,pixiv/mastodon