Add stale PR refs cleanup to iOS CI workflows (#5832)

* Add stale PR refs cleanup to iOS CI workflows

Self-hosted runners persist .git between runs. When a PR is updated,
old local refs may point to commits that were never fetched, causing
"Could not scan for Git LFS files" errors.

Applied to:
- ios_addressables_build.yml
- ios_testflight.yml

(Same fix already present in mac_build.yml and unity_build.yml)

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Fetch LFS after checkout to avoid stale ref issues

Move LFS fetching out of actions/checkout and into a separate step.
This ensures our stale PR refs cleanup runs before any LFS operations,
avoiding "Could not scan for Git LFS files" errors.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

* Fix LFS fetch order in mac_build and unity_build workflows

Apply the same fix as ios_* workflows: set lfs: false in checkout
and fetch LFS files manually afterward to avoid stale ref issues.

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

---------

Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

.github/workflows/ios_addressables_build.yml

@@ -32,13 +32,26 @@ jobs:
     runs-on: [self-hosted, macOS, unity-mac]
 
     steps:
+      - name: Prune stale PR refs
+        run: |
+          # Self-hosted runners persist .git between runs. When a PR is updated,
+          # old local refs (refs/remotes/pull/*/merge) may point to commits whose
+          # objects were never fetched or have been pruned. Remove these stale refs
+          # before checkout to prevent "missing object" errors.
+          if [ -d ".git" ]; then
+            echo "Pruning stale PR refs..."
+            git for-each-ref --format='%(refname)' refs/remotes/pull/ 2>/dev/null | \
+              xargs -r git update-ref -d 2>/dev/null || true
+          fi
       - uses: actions/checkout@v4
         with:
-          lfs: true
+          lfs: false  # Fetch LFS after checkout to avoid stale ref issues
           clean: true
 
-      - name: Pull LFS files
-        run: git lfs pull
+      - name: Fetch LFS files
+        run: |
+          git lfs install
+          git lfs pull
 
       - name: Ensure Unity version installed
         run: ./ci/github_actions/ensure_unity_installed.sh ios

.github/workflows/ios_testflight.yml

@@ -26,14 +26,27 @@ jobs:
       xcode_project_path: ${{ steps.build.outputs.xcode_project_path }}
 
     steps:
+      - name: Prune stale PR refs
+        run: |
+          # Self-hosted runners persist .git between runs. When a PR is updated,
+          # old local refs (refs/remotes/pull/*/merge) may point to commits whose
+          # objects were never fetched or have been pruned. Remove these stale refs
+          # before checkout to prevent "missing object" errors.
+          if [ -d ".git" ]; then
+            echo "Pruning stale PR refs..."
+            git for-each-ref --format='%(refname)' refs/remotes/pull/ 2>/dev/null | \
+              xargs -r git update-ref -d 2>/dev/null || true
+          fi
       - uses: actions/checkout@v4
         with:
-          lfs: true
+          lfs: false  # Fetch LFS after checkout to avoid stale ref issues
           clean: true
           fetch-depth: 0
 
-      - name: Pull LFS files
-        run: git lfs pull
+      - name: Fetch LFS files
+        run: |
+          git lfs install
+          git lfs pull
 
       - name: Ensure Unity version installed
         run: ./ci/github_actions/ensure_unity_installed.sh ios

.github/workflows/mac_build.yml

@@ -84,12 +84,14 @@ jobs:
           fi
       - uses: actions/checkout@v4
         with:
-          lfs: true
+          lfs: false  # Fetch LFS after checkout to avoid stale ref issues
           clean: true  # Remove untracked files like old SparklePlugin.bundle
           fetch-depth: 0  # For version numbering from git history
 
-      - name: Pull LFS files
-        run: git lfs pull
+      - name: Fetch LFS files
+        run: |
+          git lfs install
+          git lfs pull
 
       - name: Ensure Unity version installed
         run: ./ci/github_actions/ensure_unity_installed.sh mac

.github/workflows/unity_build.yml

@@ -69,10 +69,13 @@ jobs:
           fi
       - uses: actions/checkout@v4
         with:
-          lfs: true
+          lfs: false  # Fetch LFS after checkout to avoid stale ref issues
           clean: true  # Remove untracked files from previous builds
-      - name: Pull lfs files
-        run: git lfs pull
+
+      - name: Fetch LFS files
+        run: |
+          git lfs install
+          git lfs pull
       - name: Ensure Unity version installed
         run: ./ci/github_actions/ensure_unity_installed.sh windows
       - name: Restore Library/