Fix TypeError in ClusterFuzzLite and CloudBuild tags (#14388)

**Fix TypeError in ClusterFuzzLite**
This PR fixes a TypeError that occurs in ClusterFuzzLite projects when
the PROJECT_SRC_PATH environment variable is not set.

This issue was introduced in #14382, which added the base_os_version
property to check for Ubuntu 24.04 migration. In ClusterFuzzLite
(external projects), base_os_version attempts to read project.yaml using
PROJECT_SRC_PATH, which can be missing in some configurations.

The fix adds a fallback to self.workspace when PROJECT_SRC_PATH is
missing, which is the default behavior for ClusterFuzzLite on GitHub
Actions. A warning is also logged when this fallback occurs.

**Fix CloudBuild tags**:
The CloudBuild for infra/cifuzz was failing because it was trying to use
the ubuntu-24-04 tag for the base image, but only ubuntu-24-04-v1 was
available in GCR.

The fix updates infra/cifuzz/cloudbuild.yaml to create both ubuntu-24-04
and ubuntu-24-04-v1 tags for all images. This ensures compatibility with
existing configurations while supporting the new versioned tags.

Author: hunsche

infra/cifuzz/cloudbuild.yaml

@@ -43,6 +43,8 @@ steps:
   - build
   - '-t'
   - gcr.io/oss-fuzz-base/cifuzz-base:ubuntu-24-04-v1
+  - '-t'
+  - gcr.io/oss-fuzz-base/cifuzz-base:ubuntu-24-04
   - '-f'
   - infra/cifuzz/cifuzz-base/ubuntu-24-04.Dockerfile
   - .
@@ -52,7 +54,11 @@ steps:
   - '-t'
   - gcr.io/oss-fuzz-base/clusterfuzzlite-build-fuzzers:ubuntu-24-04-v1
   - '-t'
+  - gcr.io/oss-fuzz-base/clusterfuzzlite-build-fuzzers:ubuntu-24-04
+  - '-t'
   - gcr.io/oss-fuzz-base/cifuzz-build-fuzzers:ubuntu-24-04-v1
+  - '-t'
+  - gcr.io/oss-fuzz-base/cifuzz-build-fuzzers:ubuntu-24-04
   - '-f'
   - infra/build_fuzzers.ubuntu-24-04.Dockerfile
   - infra
@@ -62,7 +68,11 @@ steps:
   - '-t'
   - gcr.io/oss-fuzz-base/clusterfuzzlite-run-fuzzers:ubuntu-24-04-v1
   - '-t'
+  - gcr.io/oss-fuzz-base/clusterfuzzlite-run-fuzzers:ubuntu-24-04
+  - '-t'
   - gcr.io/oss-fuzz-base/cifuzz-run-fuzzers:ubuntu-24-04-v1
+  - '-t'
+  - gcr.io/oss-fuzz-base/cifuzz-run-fuzzers:ubuntu-24-04
   - '-f'
   - infra/run_fuzzers.ubuntu-24-04.Dockerfile
   - infra
@@ -78,8 +88,13 @@ images:
 - gcr.io/oss-fuzz-base/clusterfuzzlite-run-fuzzers
 - gcr.io/oss-fuzz-base/clusterfuzzlite-run-fuzzers:v1
 - gcr.io/oss-fuzz-base/cifuzz-base:ubuntu-24-04-v1
+- gcr.io/oss-fuzz-base/cifuzz-base:ubuntu-24-04
 - gcr.io/oss-fuzz-base/cifuzz-run-fuzzers:ubuntu-24-04-v1
+- gcr.io/oss-fuzz-base/cifuzz-run-fuzzers:ubuntu-24-04
 - gcr.io/oss-fuzz-base/cifuzz-build-fuzzers:ubuntu-24-04-v1
+- gcr.io/oss-fuzz-base/cifuzz-build-fuzzers:ubuntu-24-04
 - gcr.io/oss-fuzz-base/clusterfuzzlite-run-fuzzers:ubuntu-24-04-v1
+- gcr.io/oss-fuzz-base/clusterfuzzlite-run-fuzzers:ubuntu-24-04
 - gcr.io/oss-fuzz-base/clusterfuzzlite-build-fuzzers:ubuntu-24-04-v1
+- gcr.io/oss-fuzz-base/clusterfuzzlite-build-fuzzers:ubuntu-24-04
 timeout: 1800s

infra/cifuzz/config_utils.py

@@ -209,20 +209,32 @@ def base_os_version(self):
                                        'project.yaml')
     else:
       # External project.
-      project_yaml_path = os.path.join(self.project_src_path,
+      project_src_path = self.project_src_path
+      if project_src_path is None:
+        logging.info('PROJECT_SRC_PATH not set. Using workspace: %s',
+                     self.workspace)
+        project_src_path = self.workspace
+
+      project_yaml_path = os.path.join(project_src_path,
                                        self.build_integration_path,
                                        'project.yaml')
 
-    if not os.path.exists(project_yaml_path):
+    try:
+      if not os.path.exists(project_yaml_path):
+        return 'legacy'
+
+      with open(project_yaml_path) as file_handle:
+        content = file_handle.read()
+        for line in content.splitlines():
+          match = BASE_OS_VERSION_REGEX.match(line)
+          if match:
+            return match.group(1).strip('\'"')
+    except Exception:  # pylint: disable=broad-except
+      logging.warning(
+          'Failed to read project.yaml at %s. Falling back to legacy.',
+          project_yaml_path)
       return 'legacy'
 
-    with open(project_yaml_path) as file_handle:
-      content = file_handle.read()
-      for line in content.splitlines():
-        match = BASE_OS_VERSION_REGEX.match(line)
-        if match:
-          return match.group(1).strip('\'"')
-
     return 'legacy'