Fix permissions errors on ECS generation GHA workflow

.github/workflows/generate-ecs-mappings.yml

@@ -12,6 +12,8 @@ jobs:
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
+        with:
+          fetch-depth: 2
 
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
@@ -22,8 +24,11 @@ jobs:
       - name: Extract ECS Module and Run ECS Generator
         id: run-ecs-generator
         run: |
+          # Fetch base branch
+          git fetch origin +refs/heads/master:refs/remotes/origin/master
+
           # Extract the ECS module name from the modified files
-          modified_files=$(git diff --name-only HEAD^ HEAD)
+          modified_files=$(git diff --name-only origin/master)
           ecs_module=""
           for file in $modified_files; do
             if [[ $file == ecs/* ]]; then
@@ -34,7 +39,7 @@ jobs:
 
           if [[ -n "$ecs_module" ]]; then
             # Run the ECS generator script
-            docker/ecs/mapping-generator.sh run "$ecs_module"
+            bash docker/ecs/mapping-generator.sh run "$ecs_module"
             echo "ecs_module=$ecs_module" >> $GITHUB_ENV
           else
             echo "No modifications detected in ecs/ directory."
@@ -43,7 +48,7 @@ jobs:
 
       - name: Tear down ECS Generator
         if: always()
-        run: docker/ecs/mapping-generator.sh down
+        run: bash docker/ecs/mapping-generator.sh down
 
       - name: Upload artifact
         if: always()