Don't apply tag if no tag-pattern is set

CHANGELOG.md

@@ -0,0 +1,7 @@
+# v2
+
+- Fixed tag applied to images on tag event while having not set any tag-pattern
+
+# v1
+
+- initial version

compute_tags.py

@@ -23,8 +23,8 @@
 
 ref = os.getenv("GITHUB_REF").split("/", 2)[-1]
 is_tag = os.getenv("GITHUB_REF").startswith("refs/tags/")
-if is_tag:
-    exp = os.getenv("TAG_PATTERN", "")
+exp = os.getenv("TAG_PATTERN", "")
+if is_tag and exp:
     # convert from perl syntax (/pattern/) to python one
     if perl_re.match(exp):
         exp = perl_re.match(exp).groups()[-1]

tests.py

@@ -250,3 +250,15 @@ def test_tag_patterns(github_env, repo_name, tag_pattern, tag, expected):
     assert len(res) == 2
     assert f"{repo_name}:{expected}" in res
     assert f"ghcr.io/{repo_name}:{expected}" in res
+
+
+def test_tag_without_tag_pattern(github_env, repo_name):
+    res = launch_and_retrieve(
+        **get_env(
+            github_env=github_env,
+            repo_name=repo_name,
+            image_path="openzim/zimfarm-task-worker",
+            is_tag="uploader-v1.1.1",
+        )
+    )
+    assert len(res) == 0