Squashed 'release-tools/' changes from 7bc70e52..1748b16b

1748b16b Merge pull request #136 from pohly/go-1.16
ec844ea6 remove travis.yml, Go 1.16
df76aba8 Merge pull request #134 from andyzhangx/add-build-arg
e314a56d add build-arg ARCH for building multi-arch images, e.g. ARG ARCH FROM k8s.gcr.io/build-image/debian-base-${ARCH}:v2.1.3

git-subtree-dir: release-tools
git-subtree-split: 1748b16b488381c34a86ddbee110e9ed523bcb20

cloudbuild.yaml

@@ -25,7 +25,7 @@ options:
   substitution_option: ALLOW_LOOSE
 steps:
   # The image must contain bash and curl. Ideally it should also contain
-  # the desired version of Go (currently defined in release-tools/travis.yml),
+  # the desired version of Go (currently defined in release-tools/prow.sh),
   # but that just speeds up the build and is not required.
   - name: 'gcr.io/k8s-testimages/gcb-docker-gcloud:v20200421-a2bf5f8'
     entrypoint: ./.cloudbuild.sh