cirrus.yml: add CI:ALL mode to force all tests

Now that we have source based skips there might be a case where we have
to run all tests. One option is to simply change a line in one of the
danger files but having something that can be set as title might be
easier for users.

Signed-off-by: Paul Holzinger <pholzing@redhat.com>

.cirrus.yml

@@ -640,11 +640,13 @@ local_integration_test_task: &local_integration_test_task
     # Docs: ./contrib/cirrus/CIModes.md
     only_if: *not_tag_branch_build_docs_machine
     # skip when: - it is a PR (we never want to skip on nightly tests); and
+    #            - CI:ALL title is not set; and
     #            - no danger files are changed; and
     #            - when no int test code is changed; and
     #            - NOT (source code is changed AND NOT only test files)
     skip: &skip_int_test >-
         $CIRRUS_PR != '' &&
+        $CIRRUS_CHANGE_TITLE !=~ '.*CI:ALL.*' &&
         !changesInclude('.cirrus.yml', 'Makefile', 'contrib/cirrus/**', 'vendor/**', 'hack/**', 'version/rawversion/*') &&
         !changesInclude('test/e2e/**', 'test/utils/**') &&
         !(changesInclude('**/*.go', '**/*.c') && !changesIncludeOnly('test/**', 'pkg/machine/e2e/**'))
@@ -743,10 +745,12 @@ podman_machine_task:
          $CIRRUS_CHANGE_TITLE !=~ '.*CI:BUILD.*'
         ) || $CIRRUS_CRON == "main"
     # skip when: - it is a PR (we never want to skip on nightly tests); and
+    #            - CI:ALL title is not set; and
     #            - no danger files are changed; and
     #            - no machine code files are changed
     skip: &skip_machine_test >-
         $CIRRUS_PR != '' &&
+        $CIRRUS_CHANGE_TITLE !=~ '.*CI:ALL.*' &&
         !changesInclude('.cirrus.yml', 'Makefile', 'contrib/cirrus/**', 'vendor/**', 'hack/**', 'version/rawversion/*') &&
         !changesInclude('cmd/podman/machine/**', 'pkg/machine/**', '**/*machine*.go')
     depends_on: *build
@@ -871,11 +875,13 @@ local_system_test_task: &local_system_test_task
         $CIRRUS_CHANGE_TITLE !=~ '.*CI:BUILD.*' &&
         $CIRRUS_CHANGE_TITLE !=~ '.*CI:MACHINE.*'
     # skip when: - it is a PR (we never want to skip on nightly tests); and
+    #            - CI:ALL title is not set; and
     #            - no danger files are changed; and
     #            - no system test code is changed; and
     #            - NOT (source code is changed AND not only test files)
     skip: &skip_system_test >-
         $CIRRUS_PR != '' &&
+        $CIRRUS_CHANGE_TITLE !=~ '.*CI:ALL.*' &&
         !changesInclude('.cirrus.yml', 'Makefile', 'contrib/cirrus/**', 'vendor/**', 'hack/**', 'version/rawversion/*') &&
         !changesInclude('test/system/**') &&
         !(changesInclude('**/*.go', '**/*.c') && !changesIncludeOnly('test/**', 'pkg/machine/e2e/**'))
@@ -1001,10 +1007,12 @@ buildah_bud_test_task:
     # Docs: ./contrib/cirrus/CIModes.md
     only_if: *not_tag_magic
     # skip when: - it is a PR (we never want to skip on nightly tests); and
+    #            - CI:ALL title is not set; and
     #            - no danger files are changed; and
     #            - no build source files are changed and no bud tests
     skip: >-
         $CIRRUS_PR != '' &&
+        $CIRRUS_CHANGE_TITLE !=~ '.*CI:ALL.*' &&
         !changesInclude('.cirrus.yml', 'Makefile', 'contrib/cirrus/**', 'vendor/**', 'hack/**', 'version/rawversion/*') &&
         !changesInclude('**/*build*.go', 'test/buildah-bud/**')
     depends_on: *build

contrib/cirrus/CIModes.md

@@ -126,6 +126,10 @@ is removed.
 commit-change before Cirrus-CI will notice the draft-status update (i.e.
 pressing the re-run button **is not** good enough).
 
+### Intended `[CI:ALL]` behavior:
+
+Run even the tasks that are skipped based on changed sources conditions otherwise.
+
 ### Intended Branch tasks (and Cirrus-cron jobs):
 + *build*
 + swagger

contrib/cirrus/cirrus_yaml_test.py

@@ -62,7 +62,7 @@ class TestDependsOn(TestCaseBase):
 
     def test_skips(self):
         """2024-06 PR#23030: ugly but necessary duplication in skip conditions. Prevent typos or unwanted changes."""
-        beginning = "$CIRRUS_PR != '' && !changesInclude('.cirrus.yml', 'Makefile', 'contrib/cirrus/**', 'vendor/**', 'hack/**', 'version/rawversion/*') && "
+        beginning = "$CIRRUS_PR != '' && $CIRRUS_CHANGE_TITLE !=~ '.*CI:ALL.*' && !changesInclude('.cirrus.yml', 'Makefile', 'contrib/cirrus/**', 'vendor/**', 'hack/**', 'version/rawversion/*') && "
         real_source_changes = " && !(changesInclude('**/*.go', '**/*.c') && !changesIncludeOnly('test/**', 'pkg/machine/e2e/**'))"
 
         for task_name in self.ALL_TASK_NAMES: