Refactor workflows

Author: BewareMyPower

.github/changes-filter.yaml

@@ -0,0 +1,3 @@
+wireshark:
+  - 'wireshark/**'
+  - 'proto/PulsarApi.proto'

.github/workflows/ci-pr-validation.yaml

@@ -28,11 +28,33 @@ concurrency:
   cancel-in-progress: true
 
 jobs:
+  changed_files_job:
+    name: Preconditions
+    runs-on: ubuntu-20.04
+    outputs:
+      wireshark_only: ${{ steps.check_changes.outputs.wireshark_only }}
+    steps:
+      - name: checkout
+        uses: actions/checkout@v3
+
+      - name: Detect changed files
+        id:   changes
+        uses: apache/pulsar-test-infra/paths-filter@master
+        with:
+          filters: .github/changes-filter.yaml
+          list-files: csv
+
+      - name: Check changed files
+        id: check_changes
+        run: |
+          echo "::set-output name=wireshark_only::${{ fromJSON(steps.changes.outputs.all_count) == fromJSON(steps.changes.outputs.wireshark_count) && fromJSON(steps.changes.outputs.wireshark_count) > 0 }}"
 
   wireshark-dissector-build:
     name: Build the Wireshark dissector
     runs-on: ubuntu-20.04
     timeout-minutes: 60
+    needs: changed_files_job
+    if: ${{ needs.changed_files_job.outputs.wireshark_only == 'true' }}
 
     steps:
       - name: checkout
@@ -52,6 +74,8 @@ jobs:
     name: Run unit tests
     runs-on: ubuntu-22.04
     timeout-minutes: 120
+    needs: changed_files_job
+    if: ${{ needs.changed_files_job.outputs.wireshark_only != 'true' }}
 
     steps:
       - name: checkout
@@ -97,8 +121,9 @@ jobs:
   cpp-build-windows:
     timeout-minutes: 120
     name: Build CPP Client on ${{ matrix.name }}
-    needs: unit-tests
     runs-on: ${{ matrix.os }}
+    needs: ['unit-tests', 'changed_files_job']
+    if: ${{ needs.changed_files_job.outputs.wireshark_only != 'true' }}
     env:
       VCPKG_ROOT: '${{ github.workspace }}/vcpkg'
       INSTALL_DIR: 'C:\\pulsar-cpp'
@@ -214,8 +239,9 @@ jobs:
   package:
     name: Build ${{matrix.pkg.name}} ${{matrix.cpu.platform}}
     runs-on: ubuntu-22.04
-    needs: unit-tests
     timeout-minutes: 500
+    needs: ['unit-tests', 'changed_files_job']
+    if: ${{ needs.changed_files_job.outputs.wireshark_only != 'true' }}
 
     strategy:
       fail-fast: true
@@ -258,7 +284,8 @@ jobs:
     timeout-minutes: 120
     name: Build CPP Client on macOS
     runs-on: macos-12
-    needs: unit-tests
+    needs: ['unit-tests', 'changed_files_job']
+    if: ${{ needs.changed_files_job.outputs.wireshark_only != 'true' }}
     steps:
       - name: checkout
         uses: actions/checkout@v3