fix: Fix GH Action workflow (#1)

.github/workflows/test_action.yaml

@@ -2,8 +2,6 @@ name: Test Action
 on:
   pull_request:
     branches: ["main"]
-  push:
-    branches: ["main"]
 
 jobs:
   check-pr-is-updated:
@@ -13,6 +11,8 @@ jobs:
     steps:
       - name: Checkout
         uses: actions/checkout@v3
+        with:
+          fetch-depth: 0
 
       - name: 'check if the PR branch is updated or not'
         id: check_pr_is_updated

action.yaml

@@ -6,7 +6,6 @@ inputs:
   remote_branch:
     description: 'Remote branch (e.g.: upstream/main)'
     required: true
-    default: 'upstream/main'
   pr_sha:
     description: 'PR SHA'
     required: true
@@ -16,8 +15,12 @@ branding:
   color: green
 
 runs:
-  using: 'docker'
-  image: 'Dockerfile'
-  args:
-    - ${{ inputs.remote_branch }}
-    - ${{ inputs.pr_sha }}
+  using: 'composite'
+  steps:
+    - name: check if the PR branch is updated
+      shell: bash
+      run: |
+        if ! git merge-base --is-ancestor ${{ inputs.remote_branch }} ${{ inputs.pr_sha }}; then
+          echo "This branch is not up to date with ${{ inputs.remote_branch }}";
+          exit 1;
+        fi