CI: Fix the Woodpecker CI warning "Set an event filter for all steps"

.woodpecker/engine_unit-test.yml

@@ -1,7 +1,9 @@
 # .woodpecker.yml
 steps:
-  unit-test:
+  - name: unit-test
     image: python:3
+    when:
+      - event: [push, tag, manual]
     commands:
       - ls -la
       - python3 --version

.woodpecker/functional_test.yml

@@ -1,7 +1,9 @@
 # .woodpecker.yml
 steps:
-  functional-test-with-coverage:
+  - name: functional-test-with-coverage
     image: python:3
+    when:
+      - event: [push, tag, manual]
     commands:
       - ls -la
       - python3 --version

.woodpecker/package_test.yml

@@ -1,7 +1,9 @@
 # .woodpecker.yml
 steps:
-  build-test:
+  - name: build-test
     image: python:3
+    when:
+      - event: [push, tag, manual]
     commands:
       - ls -la
       - python3 --version
@@ -11,8 +13,10 @@ steps:
       - python3 -m build .
       - echo "Check the package metadata..."
       - twine check --strict dist/*
-  installation-test:
+  - name: installation-test
     image: python:3
+    when:
+      - event: [push, tag, manual]
     commands:
       - ls -la
       - cd ..

.woodpecker/static_analysis.yml

@@ -1,7 +1,9 @@
 # .woodpecker.yml
 steps:
-  static-typing-checking:
+  - name: static-typing-checking
     image: python:3
+    when:
+      - event: [push, tag, manual]
     commands:
       - ls -la
       - python3 --version
@@ -9,8 +11,10 @@ steps:
       - python3 -m pip install mypy
       - echo "Run mypy..."
       - mypy kernel_hardening_checker/ --show-error-context --pretty --no-incremental --check-untyped-defs --disallow-untyped-defs --strict-equality
-  pylint-checking:
+  - name: pylint-checking
     image: python:3
+    when:
+      - event: [push, tag, manual]
     commands:
       - ls -la
       - python3 --version