Update the CI workflow like in PyCyphal

.github/workflows/test-and-release.yml

@@ -1,5 +1,5 @@
 name: 'Test and Release PyDSDL'
-on: push
+on: [ push, pull_request ]
 
 # Ensures that only one workflow is running at a time
 concurrency:
@@ -9,6 +9,9 @@ concurrency:
 jobs:
   pydsdl-test:
     name: Test PyDSDL
+    # Run on push OR on 3rd-party PR.
+    # https://docs.github.com/en/webhooks/webhook-events-and-payloads?actionType=edited#pull_request
+    if: (github.event_name == 'push') || github.event.pull_request.head.repo.fork
     strategy:
       fail-fast: false
       matrix:
@@ -22,10 +25,10 @@ jobs:
     runs-on: ${{ matrix.os }}
     steps:
       - name: Check out pydsdl
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Check out public_regulated_data_types
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
         with:
           repository: OpenCyphal/public_regulated_data_types
           path: .dsdl-test
@@ -64,12 +67,14 @@ jobs:
 
   pydsdl-release:
     name: Release PyDSDL
-    if: contains(github.event.head_commit.message, '#release') || contains(github.ref, '/master')
+    if: >
+      (github.event_name == 'push') &&
+      (contains(github.event.head_commit.message, '#release') || contains(github.ref, '/master'))
     needs: pydsdl-test
     runs-on: ubuntu-latest
     steps:
       - name: Check out
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       - name: Build distribution
         run: |