manually specify versions of go builder images

Signed-off-by: Ashley Davis <[email protected]>

Author: SgtCoDFish

gcb/publish/cloudbuild.yaml

@@ -20,7 +20,7 @@ secrets:
 steps:
 
 ## Clone & checkout the cert-manager release repository
-- name: gcr.io/cloud-builders/go
+- name: gcr.io/cloud-builders/go:alpine-1.16
   dir: "go/src/github.com/cert-manager/release"
   entrypoint: sh
   args:

gcb/stage/cloudbuild.yaml

@@ -13,7 +13,7 @@ steps:
     git clone "${_CM_REPO}" . && git checkout "${_CM_REF}"
 
 ## Clone & checkout the cert-manager release repository
-- name: gcr.io/cloud-builders/go
+- name: gcr.io/cloud-builders/go:alpine-1.16
   dir: "go/src/github.com/cert-manager/release"
   entrypoint: sh
   args:

gcb/test/helm/cloudbuild.yaml

@@ -11,7 +11,7 @@
 # (Please do not remove this security notice.)
 steps:
 
-- name: gcr.io/cloud-builders/go
+  - name: gcr.io/cloud-builders/go:alpine-1.16
   dir: "go/src/github.com/cert-manager/release"
   entrypoint: sh
   secretEnv: