Use default GOCACHE and enable GOPROXY to fix focal fossa builds

9 jobs for master in 2 minutes and 31 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
failed #50043
docker
build/debian/buster

00:00:55

failed #50045
docker
build/ubuntu/bionic

00:01:13

passed #50044
docker
build/ubuntu/focal

00:02:31

 
  Test
skipped #50046
docker
test/debian/buster
skipped #50048
docker
test/ubuntu/bionic
skipped #50047
docker
test/ubuntu/focal
 
  Upload
skipped #50049
docker
upload/debian/buster
skipped #50051
docker
upload/ubuntu/bionic
skipped #50050
docker
upload/ubuntu/focal
 
Name Stage Failure
failed
build/ubuntu/bionic Build
debian/rules:18: recipe for target 'build' failed
make: *** [build] Error 1
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
[ binary build failed! ]
Running after_script
Updating build scripts...
Already up to date.
Uploading artifacts for failed job
ERROR: Job failed: exit code 1
failed
build/debian/buster Build
dh_auto_build: cd obj-x86_64-linux-gnu && go generate -v returned exit code 1
make: *** [debian/rules:18: build] Error 1
dpkg-buildpackage: error: debian/rules build subprocess returned exit status 2
[ binary build failed! ]
Running after_script
Updating build scripts...
Already up to date.
Uploading artifacts for failed job
ERROR: Job failed: exit code 1