feat: add file-exists action

Author: FidelusAleksander

.github/workflows/_test-file-exists-action.yml

@@ -0,0 +1,46 @@
+name: Test File Exists Action
+
+on:
+  push:
+    paths:
+      - 'actions/file-exists/**'
+  pull_request:
+    paths:
+      - 'actions/file-exists/**'
+
+jobs:
+  test-file-exists:
+    runs-on: ubuntu-latest
+    name: Test File Exists Action
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Test with existing file
+        uses: ./actions/file-exists
+        with:
+          file: README.md
+
+  test-failure-case:
+    runs-on: ubuntu-latest
+    name: Test File Not Exists (Should Fail)
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Test with non-existent file
+        uses: ./actions/file-exists
+        with:
+          file: this-file-does-not-exist.txt
+        continue-on-error: true
+        id: nonexistent
+
+      - name: Verify action failed as expected
+        if: steps.nonexistent.outcome == 'failure'
+        run: echo "✅ Action correctly failed when file doesn't exist"
+
+      - name: Fail job if action didn't fail
+        if: steps.nonexistent.outcome != 'failure'
+        run: |
+          echo "❌ Action should have failed but didn't"
+          exit 1

actions/file-exists/action.yml

@@ -0,0 +1,22 @@
+name: "File Exists"
+description: "Checks if a file exists in the repository"
+inputs:
+  file:
+    description: "The path to the file to check"
+    required: true
+runs:
+  using: "composite"
+  steps:
+    - name: Check if file exists
+      uses: actions/github-script@v7
+      with:
+        script: |
+          const fs = require('fs');
+          const filePath = process.env.GITHUB_WORKSPACE + '/' + '${{ inputs.file }}';
+
+          if (!fs.existsSync(filePath)) {
+            core.setFailed(`❌ File does not exist: ${filePath}`);
+            return;
+          }
+
+          console.log(`✅ File exists: ${filePath}`);