Actually add script

get.py

@@ -0,0 +1,52 @@
+import requests
+import subprocess
+import pathlib
+import sys
+
+
+def get_commit_hash(dir: pathlib.Path) -> str | None:
+    try:
+        return subprocess.check_output(
+            ["git", "rev-parse", "HEAD"], cwd=str(dir)
+        ).decode()
+    except subprocess.CalledProcessError:
+        return None
+
+
+def previous_run_hashes(token: str) -> str | None:
+    req = requests.get(
+        "https://api.github.com/repos/rapidsai/dask-upstream-testing/actions/artifacts",
+        headers={
+            "Accept": "application/vnd.github+json",
+            "X-GitHub-Api-Version": "2022-11-28",
+            "Authorization": token,
+        },
+        params={"name": "commit-hashes.txt", "page": 1, "per_page": 1},
+    )
+    if req.status_code != 200:
+        print("Couldn't find uploaded artifact")
+        return None
+    artifacts = req.json()["artifacts"]
+    try:
+        (artifact,) = artifacts
+        url = artifact["archive_download_url"]
+        url_req = requests.get(
+            url, headers={"X-GitHub-Api-Version": "2022-11-28", "Authorization": token}
+        )
+        if url_req.status_code != 302:
+            print("Failed", url_req.text)
+        loc = url_req.headers["Location"]
+        print(loc)
+        archive = requests.get(
+            loc, headers={"X-GitHub-Api-Version": "2022-11-28", "Authorization": token}
+        )
+        print(archive.status_code)
+        print(archive.text)
+    except ValueError:
+        # Didn't get exactly one artifact, assume we must rebuild
+        return None
+
+
+if __name__ == "__main__":
+    TOKEN = sys.argv[1]
+    previous_run_hashes(TOKEN)