CI: Extend integration testing

Refactor the integration test script to support running a variety of tests, and add CI jobs for them.

We might want to combine some of these jobs, or otherwise adjust things, but this was minimal effort to add and should improve our test coverage a bit.

pmb/helpers/git.py

@@ -56,7 +56,16 @@ def clone(name_repo: str) -> None:
         # Create parent dir and clone
         logging.info(f"Clone git repository: {url}")
         (get_context().config.work / "cache_git").mkdir(exist_ok=True)
-        pmb.helpers.run.user(command, output="stdout")
+        tries = 3
+        while tries > 0:
+            try:
+                pmb.helpers.run.user(command, output="stdout")
+                break
+            except RuntimeError as e:
+                tries -= 1
+                logging.error(f"Failed to clone repository, trying {tries} more times: {e}")
+                if tries == 0:
+                    raise
 
     # FETCH_HEAD does not exist after initial clone. Create it, so
     # is_outdated() can use it.