.github/workflow: make execution of e2e and unit tests conditional

Ref: https://docs.github.com/en/actions/using-jobs/using-conditions-to-control-job-execution

This will help to avoid blocking the merge on conditional execution
when only markdown files are changed

Signed-off-by: Jayapriya Pai <slashpai9@gmail.com>

.github/workflows/changed-files.yaml

@@ -0,0 +1,27 @@
+name: changed-files
+
+on:
+    workflow_call:
+      outputs:
+        non-markdown-files:
+          description: "changed files list"
+          value: ${{ jobs.changed-files.outputs.non-markdown-files }}
+
+jobs:
+  changed-files:
+    # Map the job outputs to step outputs
+    outputs:
+      non-markdown-files : ${{ steps.changed-files.outputs.non-markdown-files}}
+    runs-on: ubuntu-latest
+    steps:
+    - name: checkout repo
+      id: checkout
+      uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - name: get changed files
+      id: changed-files
+      run: |
+        echo non-markdown-files=$(git diff --name-only --diff-filter=ACMRT ${{ github.event.pull_request.base.sha }} ${{ github.sha }} | grep -iv .md$ | xargs) >> $GITHUB_OUTPUT
+    - run: |
+        echo "${{ steps.changed-files.outputs.non-markdown-files}}"

.github/workflows/e2e-feature-gated.yaml

@@ -1,8 +1,6 @@
 name: e2e-feature-gated
 on:
   pull_request:
-    paths-ignore:
-      - '**/*.md'
   push:
     branches:
       - 'release-*'
@@ -10,15 +8,17 @@ on:
       - 'main'
     tags:
       - 'v*'
-    paths-ignore:
-      - '**/*.md'
 # To cancel running workflow when new commits pushed in a pull request
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 jobs:
+  changed-files:
+     uses: ./.github/workflows/changed-files.yaml
   e2e-tests:
     name: E2E tests for feature gates
+    needs: changed-files
+    if: ${{ needs.changed-files.outputs.non-markdown-files }}
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v4

.github/workflows/e2e.yaml

@@ -1,8 +1,6 @@
 name: e2e
 on:
   pull_request:
-    paths-ignore:
-      - '**/*.md'
   push:
     branches:
       - 'release-*'
@@ -10,16 +8,18 @@ on:
       - 'main'
     tags:
       - 'v*'
-    paths-ignore:
-      - '**/*.md'
 # To cancel running workflow when new commits pushed in a pull request
 concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 jobs:
+  changed-files:
+    uses: ./.github/workflows/changed-files.yaml
   e2e-tests:
     name: E2E tests
     runs-on: ubuntu-latest
+    needs: changed-files
+    if: ${{ needs.changed-files.outputs.non-markdown-files }}
     strategy:
       matrix:
         suite: [alertmanager, prometheus, prometheusAllNS, thanosruler, operatorUpgrade]
@@ -105,8 +105,9 @@ jobs:
   # Added to summarize the matrix and allow easy branch protection rules setup
   e2e-tests-result:
     name: End-to-End Test Results
-    if: always()
+    if: ${{ needs.changed-files.outputs.non-markdown-files }}
     needs:
+      - changed-files
       - e2e-tests
     runs-on: ubuntu-latest
     steps:

.github/workflows/unit.yaml

@@ -17,9 +17,13 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 jobs:
+  changed-files:
+     uses: ./.github/workflows/changed-files.yaml
   unit-tests:
-    runs-on: ubuntu-latest
     name: Unit tests
+    runs-on: ubuntu-latest
+    needs: changed-files
+    if: ${{ needs.changed-files.outputs.non-markdown-files }}
     steps:
     - uses: actions/checkout@v4
     - name: Import environment variables from file
@@ -32,6 +36,8 @@ jobs:
   extended-tests:
     runs-on: ubuntu-latest
     name: Extended tests
+    needs: changed-files
+    if: ${{ needs.changed-files.outputs.non-markdown-files }}
     steps:
     - uses: actions/checkout@v4
     - name: Import environment variables from file