WIP

Signed-off-by: Derek Su <derek.su@suse.com>

.github/workflows/update-branch-image-versions.yaml

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+name: Update Longhorn Repository Branch Image Tags
+
+on:
+  workflow_dispatch:
+    inputs:
+      branch:
+        description: "Branch, ex: v1.7.x"
+        required: true
+      tag:
+        description: "Tag, ex: v1.7.x-head"
+        required: true
+
+defaults:
+  run:
+    shell: bash
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+
+    env:
+      GITHUB_TOKEN: ${{ secrets.GH_ACTION_TOKEN }}
+
+    steps:
+    - name: Setup Git
+      run: |
+        gh auth setup-git
+
+    - uses: actions/checkout@v4
+
+    - name: Update repo branch image tags
+      run: ./scripts/update-repo-branch-image-tags.sh ${{ inputs.branch }} ${{ inputs.tag }}
+
+    - name: Commit and Create Pull Request
+      uses: peter-evans/create-pull-request@v7
+      with:
+        branch: "update-image-tags-${{ inputs.branch }}"
+        commit-message: "chore: update image tags in deploy/longhorn-images.txt"
+        title: "Update image tags for branch ${{ inputs.branch }}"
+        body: |
+          This PR updates the image tags in `deploy/longhorn-images.txt` to use the tag `${{ inputs.tag }}`.
+        labels: |
+          automation

.github/workflows/update-repo-branch-image-tags.sh

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+#!/usr/bin/env bash
+
+set -o errexit
+set -o xtrace
+
+if [ "$#" -ne 2 ]; then
+  echo "Illegal number of arguments. branch and tag are required." >/dev/stderr
+  exit 1
+fi
+
+branch=$1
+tag=$2
+
+repos_dir=.repos
+
+images=(
+  longhornio/backing-image-manager
+  longhornio/longhorn-engine
+  longhornio/longhorn-instance-manager
+  longhornio/longhorn-manager
+  longhornio/longhorn-share-manager
+  longhornio/longhorn-ui
+  longhornio/longhorn-cli
+)
+
+function replace_images_tags_in_longhorn_images_txt() {
+  local input_file="$1"
+  local tag="$2"
+
+  local output_file="${input_file}.new"
+
+  if [ -z "$input_file" ] || [ -z "$tag" ]; then
+    echo "Usage: replace_longhorn_images <input_file> <tag>"
+    return 1
+  fi
+
+  while IFS= read -r line; do
+    modified=false
+    for img in "${images[@]}"; do
+      if [[ "$line" == *"$img"* ]]; then
+        if [[ "$line" =~ $img(:[^ ]*)? ]]; then
+          line=$(echo "$line" | sed -E "s|$img(:[^ ]*)?|$img:$tag|")
+          modified=true
+          break
+        fi
+      fi
+    done
+    echo "$line" >> "$output_file"
+  done < "$input_file"
+
+  if [ $? -eq 0 ]; then
+    mv "$output_file" "$input_file"
+    echo "Successfully replaced Longhorn image tags in '$input_file'."
+  else
+    rm -f "$output_file"
+    echo "Error: Failed to replace Longhorn image tags."
+    return 1
+  fi
+}
+
+function teardown() {
+  rm -rf $repos_dir
+}
+trap teardown EXIT
+
+mkdir -p $repos_dir
+
+pushd $repos_dir
+
+git checkout "$branch"
+
+replace_images_tags_in_longhorn_images_txt "deploy/longhorn-images.txt" "${tag}"
+
+popd