Add image prefix for PRs.

Signed-off-by: Mangirdas Judeikis <[email protected]>
 On-behalf-of: @SAP [email protected]

.github/workflows/gh-image-purge.yaml

@@ -0,0 +1,18 @@
+name: Daily Image Cleanup
+on:
+  # every day at 01:30am
+  schedule:
+    - cron: '30 1 * * *'
+jobs:
+  - name: ghcr cleanup action
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dataaxiom/ghcr-cleanup-action@v1
+        with:
+          older-than: 1 month
+          owner: kcp-dev
+          repository: kcp
+          package: kcp
+          delete-tags: '^pr-\d+-[a-z0-9]+-[a-z0-9]+$'
+          use-regex: true
+          dry-run: true

.prow.yaml

@@ -64,9 +64,6 @@ presubmits:
         - image: quay.io/containers/buildah:v1.30.0
           command:
             - hack/build-image.sh
-          env:
-            - name: DRY_RUN
-              value: '1'
           # docker-in-docker needs privileged mode
           securityContext:
             privileged: true

hack/build-image.sh

@@ -60,9 +60,9 @@ if [ -n "${PULL_BASE_REF:-}" ]; then
   fi
 fi
 
-# Prefix with "dev-" if not on a tag or branch
-if [ -z "$branchName" ]; then
-  version="dev-$version"
+# Prefix with "pr-" if not on a tag or branch
+if [ -n "${PULL_NUMBER:-}" ]; then
+  version="pr-$PULL_NUMBER-$version"
 fi
 
 image="$repository:$version"