try debug what's wrong with Registry.toml file (JuliaRegistries#354)

* try debug what's wrong with Registry.toml file

* Update repo.py

* add log

* Create tagbot.yml

.github/workflows/tagbot.yml

@@ -0,0 +1,33 @@
+name: TagBot
+on:
+  issue_comment:
+    types:
+      - created
+  workflow_dispatch:
+    inputs:
+      lookback:
+        default: "3"
+permissions:
+  actions: read
+  checks: read
+  contents: write
+  deployments: read
+  issues: read
+  discussions: read
+  packages: read
+  pages: read
+  pull-requests: read
+  repository-projects: read
+  security-events: read
+  statuses: read
+jobs:
+  TagBot:
+    if: github.event_name == 'workflow_dispatch' || github.actor == 'JuliaTagBot'
+    runs-on: ubuntu-latest
+    steps:
+      - uses: JuliaRegistries/TagBot@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          # Edit the following line to reflect the actual name of the GitHub Secret containing your private key
+          ssh: ${{ secrets.DOCUMENTER_KEY }}
+          # ssh: ${{ secrets.NAME_OF_MY_SSH_PRIVATE_KEY_SECRET }}

tagbot/action/repo.py

@@ -88,6 +88,7 @@ def __init__(
         except Exception:
             # This is an awful hack to let me avoid properly fixing the tests...
             if "pytest" in sys.modules:
+                logger.warning("'awful hack' in use")
                 self._registry = self._gh.get_repo(registry, lazy=True)
                 self._clone_registry = False
             else:
@@ -155,7 +156,18 @@ def _registry_path(self) -> Optional[str]:
                 registry = toml.load(f)
         else:
             contents = self._only(self._registry.get_contents("Registry.toml"))
-            registry = toml.loads(contents.decoded_content.decode())
+            # show file contents if cannot be decoded
+            try:
+                string_contents = contents.decoded_content.decode()
+            except AssertionError:
+                logger.info(
+                    f"Registry.toml could not be decoded. Raw contents: {contents}"
+                )
+                # rethrow now we've logged info
+                raise
+
+            registry = toml.loads(string_contents)
+
         if uuid in registry["packages"]:
             self.__registry_path = registry["packages"][uuid]["path"]
             return self.__registry_path