feature: when merging environments, promote tag from previous env to next env

src/git_flow/remote/bitbucket.py

@@ -48,12 +48,7 @@ class BitbucketRemoteAPI(RemoteAPI):
             raise GitFlowError("Ocurrió un error al crear el tag: " + response.text)
 
     def get_merge_commits(self, merge_commit: str) -> list[Commit]:
-        prs = self.get_json(self.get_endpoint(f"commit/{merge_commit}/pullrequests")).json()
-        pr = next((p for p in prs["values"] if p["state"] == "MERGED"), None)
-
-        if not pr:
-            raise GitFlowError(f"No se encontró un PR para el commit {merge_commit}")
-
+        pr = self._get_merge_pull_request(merge_commit)
         commits: list[Commit] = []
         url: str | None = self.get_endpoint(f"pullrequests/{pr['id']}/commits")
 
@@ -77,6 +72,18 @@ class BitbucketRemoteAPI(RemoteAPI):
 
         return commits
 
+    def get_merge_source_branch(self, merge_commit: str) -> str:
+        return self._get_merge_pull_request(merge_commit)["source"]["branch"]["name"]
+
+    def _get_merge_pull_request(self, merge_commit: str) -> dict:
+        prs = self.get_json(self.get_endpoint(f"commit/{merge_commit}/pullrequests")).json()
+        pr = next((p for p in prs["values"] if p["state"] == "MERGED"), None)
+
+        if not pr:
+            raise GitFlowError(f"No se encontró un PR para el commit {merge_commit}")
+
+        return pr
+
     def list_tags(self, suffix: str = "") -> list[str]:
         names: list[str] = []
         url: str | None = self.get_endpoint("refs/tags")