Clarify where the RUN command runs from
Clarify where the RUN command runs from

Also, chained/quoted shell does not work

Signed-off-by: Julien Maitrehenry <82f09365e92b2eb893c9a5cce711a84f6d735b95@me.com>

konstruktoid/docker-1,gjaskiewicz/moby,bonczj/moby-json-file-logger,resin-io/docker,sarnautov/moby,tianon/docker,gnailuy/docker,fcrisciani/docker,mixja/docker,johnstep/moby-moby,Mokolea/docker,moby/moby,jvanz/docker,pradipd/moby,maxamillion/docker,PatrickLang/moby,djs55/docker,yongtang/docker,ibuildthecloud/docker,cpuguy83/docker,cyphar/docker,imkin/moby,coreos/docker,crosbymichael/docker,mikebrow/docker,jimjag/docker,mkumatag/docker,allencloud/docker,djs55/docker,dims/docker,coolljt0725/docker,paralin/docker,KarthikNayak/docker,pradipd/moby,estesp/docker,vdemeester/docker,dperny/docker,laijs/moby,maxamillion/docker,Mokolea/docker,madhanrm/docker,moul/docker,tonistiigi/docker,POLJM242/docker,lixiaobing10051267/docker,naveed-jamil-tenpearls/moby,rhatdan/docker,sterchelen/docker,haveatry/docker,ndeloof/docker,duglin/docker,ibuildthecloud/docker,nawawi/docker,yosifkit/docker,danyalKhaliq10p/moby,jlhawn/docker,duglin/docker,haveatry/docker,haveatry/docker,nalind/docker,estesp/docker,justincormack/docker,tophj-ibm/moby,yosifkit/docker,gnailuy/docker,dccurtis/docker,gnailuy/docker,amatsus/docker,jwhonce/docker,vdemeester/docker,kencochrane/docker,madhanrm/docker,Ramzec/docker,coreos/docker,noironetworks/docker,rancher/docker,liaoqingwei/docker,kolyshkin/moby,justincormack/docker,bonczj/moby-json-file-logger,nalind/docker,KingEmet/docker,allencloud/docker,sterchelen/docker,lixiaobing1/docker,paralin/docker,raja-sami-10p/moby,gnailuy/docker,AkihiroSuda/docker,bonczj/moby-json-file-logger,justincormack/docker,prertik/docker,fcrisciani/docker,resin-io/docker,cpuguy83/docker,laijs/docker,shishir-a412ed/docker,mahak/docker,PatrickLang/moby,docker/docker,JMesser81/docker,jwhonce/docker,sdurrheimer/docker,shhsu/docker,whuwxl/docker,tonistiigi/docker,flavio/docker,shishir-a412ed/docker,trebonian/docker,jvanz/docker,trebonian/docker,raja-sami-10p/moby,hqhq/moby,kojiromike/docker,KingEmet/docker,ColinHebert/docker,laijs/docker,mixja/docker,rancher/docker,tmp6154/docker,raja-sami-10p/moby,dsheets/moby,AkihiroSuda/docker,whuwxl/docker,jwhonce/docker,lixiaobing1/docker,pradipd/moby,jlhawn/docker,gschaetz/moby,ripcurld0/moby,Ramzec/docker,yummypeng/docker,charleszheng44/moby,imkin/moby,tonistiigi/docker,kencochrane/docker,yongtang/docker,ndeloof/docker,resin-io/docker,flavio/docker,dsheets/moby,rremer/moby,nawawi/docker,trebonian/docker,KarthikNayak/docker,tophj-ibm/docker,AkihiroSuda/docker,miminar/docker,konstruktoid/docker-1,bearstech/moby,kencochrane/docker,shhsu/docker,mkumatag/docker,coreos/docker,moul/docker,Ramzec/docker,jimjag/docker,mahak/docker,johnstep/moby-moby,moby/moby,YuPengZTE/docker,mahak/docker,yummypeng/docker,srust/docker,ndeloof/docker,kolyshkin/docker,ColinHebert/docker,dims/docker,prertik/docker,charleszheng44/moby,shishir-a412ed/docker,unclejack/docker,gjaskiewicz/moby,pramodhkp/moby,kojiromike/docker,dims/docker,nawawi/docker,tklauser/docker,sarnautov/moby,coolljt0725/docker,jameszhan/docker,cpuguy83/docker,yasiramin10p/moby,laijs/moby,naveed-jamil-tenpearls/moby,mikebrow/docker,amatsus/docker,kolyshkin/docker,thaJeztah/docker,tmp6154/docker,konstruktoid/docker-upstream,crosbymichael/docker,x1022as/docker,tophj-ibm/moby,mixja/docker,danyalKhaliq10p/moby,kojiromike/docker,konstruktoid/docker-1,imkin/moby,gschaetz/moby,yasiramin10p/moby,estesp/docker,tmp6154/docker,laijs/docker,dccurtis/docker,cyphar/docker,thaJeztah/docker,laijs/moby,tklauser/docker,lixiaobing1/docker,JMesser81/docker,konstruktoid/docker-upstream,konstruktoid/docker-upstream,mtesselH/docker,dccurtis/docker,ibuildthecloud/docker,yummypeng/docker,yongtang/docker,konstruktoid/docker-upstream,mtesselH/docker,mike1729/docker,duglin/docker,tklauser/docker,jthelin/docker,miminar/docker,SvenDowideit/docker,scotttlin/docker,jlhawn/docker,SvenDowideit/docker,YuPengZTE/docker,jvanz/docker,whuwxl/docker,tianon/docker,sterchelen/docker,coolljt0725/docker,thaJeztah/docker,mkumatag/docker,bearstech/moby,paralin/docker,yasiramin10p/moby,ColinHebert/docker,johnstep/moby-moby,bearstech/moby,jimjag/docker,PatrickLang/moby,jimjag/docker,ibuildthecloud/docker,allencloud/docker,vdemeester/docker,srust/docker,rremer/moby,dmcgowan/docker,AkihiroSuda/docker,SvenDowideit/docker,thaJeztah/docker,Ramzec/docker,prertik/docker,srust/docker,pramodhkp/moby,yosifkit/docker,JMesser81/docker,paralin/docker,hqhq/moby,flavio/docker,gjaskiewicz/moby,unclejack/docker,sdurrheimer/docker,rancher/docker,madhanrm/docker,scotttlin/docker,fcrisciani/docker,lixiaobing10051267/docker,charleszheng44/moby,yosifkit/docker,x1022as/docker,Mokolea/docker,crosbymichael/docker,miminar/docker,moby/moby,hqhq/moby,rhatdan/docker,x1022as/docker,YuPengZTE/docker,ibuildthecloud/docker,KingEmet/docker,cpuguy83/docker,kolyshkin/moby,tophj-ibm/docker,docker/docker,nalind/docker,tophj-ibm/moby,shhsu/docker,POLJM242/docker,mikebrow/docker,kolyshkin/moby,jthelin/docker,rremer/moby,dmcgowan/docker,Mokolea/docker,bearstech/moby,noironetworks/docker,sarnautov/moby,ripcurld0/moby,jameszhan/docker,liaoqingwei/docker,dmcgowan/docker,nawawi/docker,mtesselH/docker,pramodhkp/moby,mike1729/docker,danyalKhaliq10p/moby,trebonian/docker,jameszhan/docker,amatsus/docker,maxamillion/docker,dperny/docker,moul/docker,sdurrheimer/docker,mike1729/docker,djs55/docker,lixiaobing10051267/docker,dsheets/moby,cyphar/docker,scotttlin/docker,ripcurld0/moby,nalind/docker,gschaetz/moby,noironetworks/docker,mahak/docker,flavio/docker,rhatdan/docker,liaoqingwei/docker,docker/docker,KarthikNayak/docker,moul/docker,tophj-ibm/docker,naveed-jamil-tenpearls/moby,unclejack/docker,dperny/docker,moby/moby