ci: ignore yarn.lock when the branch is valid (#9849)

closes #9850

.github/actions/restore-node/action.yml

@@ -185,8 +185,9 @@ runs:
       uses: pyTooling/Actions/with-post-step@v0.4.5
       with:
         main: |
-          bash "$SRC/.github/actions/restore-node/check-git-status.sh" "$SRC"
+          bash "$SRC/.github/actions/restore-node/check-git-status.sh" "$SRC" "$IGNORE_DIRTY_YARN_LOCK"
         post: |
-          bash "$SRC/.github/actions/restore-node/check-git-status.sh" "$SRC"
+          bash "$SRC/.github/actions/restore-node/check-git-status.sh" "$SRC" "$IGNORE_DIRTY_YARN_LOCK"
       env:
         SRC: ${{ inputs.path }}
+        IGNORE_DIRTY_YARN_LOCK: ${{ steps.endo-branch.outputs.result != 'NOPE' }}

.github/actions/restore-node/check-git-status.sh

@@ -1,11 +1,26 @@
 #!/bin/bash
+
 # Set verbose execution
 set -x
+
 # Navigate to the specified directory
 cd "$1" || exit $?
+
+# Get the value of IGNORE_ENDO_BRANCH
+ignore_dirty_yarn_lock=$2 || exit $?
+
 # Check for unexpected changes
 # Fail if git status detects changes
 changes=$(git status --porcelain)
+
+if [ "$ignore_dirty_yarn_lock" = true ]; then
+  # When integration is requested with a specific Endo branch, ignore changes:
+  # - package.json has a modified `"resolutions":` field,
+  # - yarn.lock is changed because of those resolutions.
+  # For more details, refer to https://github.com/Agoric/agoric-sdk/issues/9850.
+  changes=$(echo "$changes" | grep -v " yarn.lock")
+fi
+
 if [ -n "$changes" ]; then
   git status
   echo "Unexpected dirty git status in Agoric SDK path"