Fix getopts in mkimage-alpine.sh
Fix getopts in mkimage-alpine.sh

Signed-off-by: Robert Schneider <1d6e1cf70ec6f9ab28d3ea4b27a49a77654d370e@shakeme.info>

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