feature: tag from ci fetches commits from remote api

src/git_flow/remote/bitbucket.py

@@ -1,5 +1,8 @@
+import re
+
 import requests
 from git_flow import GitFlowError
+from git_flow.git import Commit
 from git_flow.remote.base import RemoteAPI
 
 
@@ -44,5 +47,35 @@ class BitbucketRemoteAPI(RemoteAPI):
         else:
             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}")
+
+        commits: list[Commit] = []
+        url: str | None = self.get_endpoint(f"pullrequests/{pr['id']}/commits")
+
+        # Bitbucket pagina siguiendo el link "next", y devuelve del más nuevo al más viejo
+        while url:
+            page = self.get_json(url).json()
+
+            for c in page["values"]:
+                raw = c["author"].get("raw", "")
+                match = re.search(r"<(.+?)>", raw)
+                commits.append(
+                    Commit(
+                        c["hash"][:7],
+                        c["message"].splitlines()[0],
+                        match.group(1) if match else raw,
+                        len(c["parents"]) > 1,
+                    )
+                )
+
+            url = page.get("next")
+
+        return commits
+
     def get_endpoint(self, resource: str) -> str:
         return f"{BitbucketRemoteAPI.API_ENDPOINT}/{self.repository}/{resource}"