Modify actions to avoid processing when only doc PRs (#754)

- Update paths filter to recent version
- Avoid running FPC test when only changes to markdown files (docu updates)
- Add new workflow for documentation

---------

Signed-off-by: munapower <mmunaro@hotmail.com>
Signed-off-by: Marcus Brandenburger <bur@zurich.ibm.com>
Co-authored-by: Marcus Brandenburger <bur@zurich.ibm.com>

.github/workflows/documentation.yml

@@ -0,0 +1,41 @@
+#
+# SPDX-License-Identifier: Apache-2.0
+#
+
+name: Check Documentation
+on:
+  push:
+    paths:
+    - '**.md'
+defaults:
+  run:
+    shell: bash
+permissions: {}
+jobs:
+  check-md-only:
+    name: This job was triggered
+    runs-on: ubuntu-latest
+    outputs:
+      md-only: ${{ steps.test-md-only.outputs.md-only }}
+    permissions:
+        contents: read
+    steps:
+    - name: Checkout
+      uses: actions/checkout@v3
+      with:
+        fetch-depth: 2 # required to compare HEAD^
+    - run: git diff --name-only HEAD^..HEAD
+    - name: Test MD only
+      id: test-md-only
+      run: >-
+        [ -z "$(git diff --name-only HEAD^..HEAD | grep -ve "\.md$")" ] &&
+        echo "md-only=${{toJSON(true)}}" >> $GITHUB_OUTPUT ||
+        echo "md-only=${{toJSON(false)}}" >> $GITHUB_OUTPUT
+  build:
+    name: Run if only MD files
+    needs: ['check-md-only']
+    runs-on: ubuntu-latest
+    if: ${{ fromJSON(needs.check-md-only.outputs.md-only) == true }}
+    steps:
+    - run: echo ran
+

.github/workflows/test.yml

@@ -3,8 +3,15 @@
 #
 
 name: FPC test
-on: [push, pull_request]
-
+on: 
+  push:
+    paths-ignore: 
+      - '**.md'
+      - '.github/workflows/**'
+  pull_request:
+     paths-ignore: 
+       - '**.md'
+       - '.github/workflows/**'
 env:
   DOCKER_REGISTRY: 'ghcr.io'
   PUSH_TO_MAIN: ${{ github.event_name == 'push' && github.ref == 'refs/heads/main' }}
@@ -25,13 +32,12 @@ jobs:
         with:
           submodules: 'recursive'
 
-      - uses: dorny/paths-filter@v2
+      - uses: dorny/paths-filter@v3
         id: filter
         with:
           filters: |
             docker:
               - 'utils/docker/**'
-
       - name: build dev image
         if: steps.filter.outputs.docker == 'true'
         env: