Fix release cloudbuild config

Cloudbuild creates a very minimal git repo -- the checkout doesn't have
tags, branches, or other commits.  Previously, we were grabbing other
tags and branches, but weren't correcting which branch we were on,
which was confusing the new release notes tooling.

Now, we load all branches & tags, create local branches for all remote
release branches, point the current release branch at the given tag just
to be safe, then delete the current tag.  We re-add the current tag once
the release notes tooling has done its thing.

Author: DirectXMan12

build/build_kubebuilder.sh

@@ -81,7 +81,21 @@ if [ -z "$SNAPSHOT" ]; then
   tmp_notes="$(mktemp)"
   trap "rm -f ${tmp_notes}" EXIT
   install_notes
+  if [[ -n "${CLOUD_BUILD}" ]]; then
+      # we refresh just before this, no point (plus, we fiddle with the current branch a bit)
+      NOTES_FLAGS+=" --use-upstream=false"
+      # we can look for tag alpha/beta here too
+      # (TODO(directxman12): this should be in the tool)
+      [[ "${TAG_NAME}" == "v"*"-alpha."* ]] && NOTES_FLAGS+=" -r alpha"
+      [[ "${TAG_NAME}" == "v"*"-beta."* ]] && NOTES_FLAGS+=" -r beta"
+      [[ "${TAG_NAME}" == "v"*"-rc."* ]] && NOTES_FLAGS+=" -r rc"
+  fi
   notes $NOTES_FLAGS | tee "$tmp_notes"
+  # we need to delete the tag for the release notes script, so restore it when done so that
+  # go releaser can find the right tag
+  if [[ -n "${TAG_NAME}" ]]; then
+      git tag ${TAG_NAME}
+  fi
   GORELEASER_FLAGS="${GORELEASER_FLAGS} --release-notes=${tmp_notes}"
 else
   # TODO(estroz): figure out how to generate snapshot release notes with the kubebuilder generator.

build/cloudbuild.yaml

@@ -20,11 +20,31 @@
 
 steps:
 - name: "gcr.io/cloud-builders/git"
-  args: ["fetch", "--tags", "--unshallow"]
+  entrypoint: 'bash'
+  args:
+  - '-c'
+  - |
+    git fetch --tags --unshallow
+    git for-each-ref --contains HEAD
+    # TAG_NAME is defined by GCB, so uses 1 dollar sign, BRANCH_NAME is bash, so we need to escape it
+    # with two dollar signs
+    export BRANCH_NAME=$(git for-each-ref --format="%(refname:strip=-1)" --contains HEAD 'refs/remotes/origin/release-*')
+    export ALL_BRANCHES=$(git for-each-ref --format="%(refname:strip=-1)" 'refs/remotes/origin/release-*')
+    echo "branch: $${BRANCH_NAME}, tag: ${TAG_NAME}, all release branches: $${ALL_BRANCHES}"
+    for branch in $${ALL_BRANCHES}; do
+      git branch $${branch} origin/$${branch}
+    done
+    git branch -f $${BRANCH_NAME} HEAD
+    git checkout $${BRANCH_NAME}
+    git branch --set-upstream-to=origin/$${BRANCH_NAME}
+    git tag -d ${TAG_NAME}
 - name: "goreleaser/goreleaser:v0.147"
   entrypoint: "bash"
   args: ["build/build_kubebuilder.sh"]
   secretEnv: ["GITHUB_TOKEN"]
+  env:
+  - 'TAG_NAME=$TAG_NAME'
+  - 'CLOUD_BUILD=true'
 secrets:
 - kmsKeyName: projects/kubebuilder/locations/global/keyRings/kubebuilder-gh-tokens/cryptoKeys/gh-release-token
   secretEnv: