diff --git a/.forgejo/workflows/check-version-exists.yaml b/.forgejo/workflows/check-version-exists.yaml
deleted file mode 100644
index e2baaa4..0000000
--- a/.forgejo/workflows/check-version-exists.yaml
+++ /dev/null
@@ -1,34 +0,0 @@
-on:
-  workflow_call:
-    inputs:
-      github-repository:
-        required: true
-        type: string
-      pypi-package:
-        required: true
-        type: string
-      pypi-base-url:
-        required: true
-        type: string
-    outputs:
-      version: ${{ jobs.check-version-exists.outputs.version }}
-
-jobs:
-  check-version-exists:
-    runs-on: ubuntu-latest
-
-    outputs:
-      version: ${{ steps.check.outputs.version }}
-
-    steps:
-      - uses: actions/checkout@v4
-
-      - id: check
-        run: |
-          pip3 install requests
-          exec python3 .forgejo/workflows/check_version_exists.py >> $GITHUB_OUTPUT 
-        env:
-          REPOSITORY: ${{ inputs.github-repository }}
-          PACKAGE: ${{ inputs.pypi-package}}
-          BASE_URL: ${{ inputs.pypi-base-url}}
-
diff --git a/.forgejo/workflows/check_version_exists.py b/.forgejo/workflows/check_version_exists.py
deleted file mode 100644
index d6efa40..0000000
--- a/.forgejo/workflows/check_version_exists.py
+++ /dev/null
@@ -1,37 +0,0 @@
-#/usr/bin/env python3
-
-import os
-import re
-import sys
-import requests
-
-
-def get_github_version(repository: str) -> str:
-    res = requests.get(f"https://api.github.com/repos/{repository}/releases/latest").json()
-    return res["tag_name"].removeprefix("v")
-
-
-def does_pypi_version_exist(base_url: str, package: str, version: str) -> bool:
-    base_url = base_url.removesuffix("/")
-    version = version.replace(".", "\\.")
-
-    body = requests.get(f"{base_url}/simple/{package}").text
-    return len(re.findall(rf"<a href=\".+\">{package}-{version}-.+</a>", body, re.MULTILINE)) > 0
-
-
-def main():
-    repository = os.environ["REPOSITORY"]
-    package = os.environ["PACKAGE"]
-    base_url = os.environ["FORGEJO_URL"]
-
-    version = get_github_version(repository)
-
-    if does_pypi_version_exist(base_url, package, version):
-        sys.exit(0)
-
-    print(f"version=v{version}")
-
-
-if __name__ == "__main__":
-    main()
-
diff --git a/.forgejo/workflows/pycairo.yaml b/.forgejo/workflows/pycairo.yaml
deleted file mode 100644
index 6e7631c..0000000
--- a/.forgejo/workflows/pycairo.yaml
+++ /dev/null
@@ -1,49 +0,0 @@
-name: Build pycairo
-
-on:
-  workflow_dispatch:
-  schedule:
-    - cron: "0 10 * * 0"
-
-env:
-  REPOSITORY_URL: https://cmwedding-bot:${{ secrets.FORGEJO_TOKEN }}@git.weddingfactory.eu/api/packages/cmwedding/pypi
-
-jobs:
-  check-version-exists:
-    runs-on: ubuntu-latest
-    uses: ./.forgejo/workflows/check-version-exists.yaml
-    with:
-      pypi-base-url: ${{ env.REPOSITORY_URL }}
-      pypi-package: pycairo
-      github-repository: "pygobject/pycairo"
-
-  build:
-    name: Build wheels on ${{ matrix.os }}
-    
-    needs: check-version-exists
-    if: needs.check-version-exists.outputs.version != ""
-
-    runs-on: ${{ matrix.os }}
-    strategy:
-      matrix:
-        os: [ubuntu-latest]
-
-    steps:
-      - run: git clone --depth=1 https://github.com/pygobject/pycairo --branch ${{ needs.check-version-exists.outputs.version }} .
-
-      - name: Build wheels
-        uses: https://github.com/pypa/cibuildwheel@v2.23.3
-        env:
-          CIBW_BEFORE_ALL_LINUX: "dnf install -y cairo-devel"
-          CIBW_BUILD: "cp31{0..3}-manylinux_{x86_64,aarch64}"
-          CIBW_MANYLINUX_X86_64_IMAGE: manylinux_2_28
-          CIBW_MANYLINUX_AARCH64_IMAGE: manylinux_2_28
- 
-      - name: Publish package distributions to Forgejo
-        run: |
-          pip3 install twine
-          python3 -m twine upload ./wheelhouse/*
-        env:
-          TWINE_REPOSITORY_URL: ${{ env.REPOSITORY_URL }}
-          TWINE_NON_INTERACTIVE: 1
-
diff --git a/action.yaml b/action.yaml
new file mode 100644
index 0000000..f6a80b4
--- /dev/null
+++ b/action.yaml
@@ -0,0 +1,36 @@
+name: "check-latest-version-exists action"
+description: "Check whether the latest GitHub release/tag of a PyPI package exists on a registry. If not, return the latest version."
+
+inputs:
+  pypi-package:
+    description: "The name of the package"
+    required: true
+  pypi-base-url:
+    description: "The PyPI registry URL"
+    required: true
+  github-repository:
+    description: "The package's GitHub repository name (owner/repo)"
+    required: true
+  unstable-branch:
+    description: "Whether to get a version representing the latest commit on this branch"
+    required: false
+
+outputs:
+  version:
+    description: "The version of the package"
+    value: ${{ steps.check.outputs.version }}
+
+runs:
+  using: "composite"
+  steps:
+    - id: check
+      shell: bash
+      run: |
+        pip3 install requests
+        exec python3 $GITHUB_ACTION_PATH/check.py >> $GITHUB_OUTPUT 
+      env:
+        REPOSITORY: ${{ inputs.github-repository }}
+        PACKAGE: ${{ inputs.pypi-package }}
+        BASE_URL: ${{ inputs.pypi-base-url }}
+        BRANCH: ${{ inputs.unstable-branch }}
+
diff --git a/check.py b/check.py
new file mode 100644
index 0000000..ccc491a
--- /dev/null
+++ b/check.py
@@ -0,0 +1,64 @@
+#/usr/bin/env python3
+
+import os
+import re
+import sys
+import requests
+
+from datetime import datetime
+
+
+def get_release_version(repository: str) -> str: 
+    try:
+        return requests.get(f"https://api.github.com/repos/{repository}/releases/latest").json()["tag_name"].removeprefix("v")
+    except Exception:
+        return requests.get(f"https://api.github.com/repos/{repository}/tags").json()[0]["name"].removeprefix("v")
+
+
+def get_unstable_version(repository: str, branch: str) -> str:
+    base_url = f"https://api.github.com/repos/{repository}/commits?sha={branch}"
+
+    latest_commit = requests.get(f"{base_url}&per_page=1").json()[0]
+    commit_date = datetime.strptime(latest_commit["commit"]["committer"]["date"], "%Y-%m-%dT%H:%M:%SZ")
+
+    since_iso = commit_date.replace(hour=0, minute=0, second=0, microsecond=0).isoformat().replace("+00:00", "Z")
+    
+    commit_count = 0
+    page = 1
+    
+    while True:
+        commits = requests.get(f"{base_url}&since={since_iso}&per_page=100&page={page}").json()
+        commit_count += len(commits)
+
+        if len(commits) < 100:
+            break
+        
+        page += 1
+
+    return f"{branch}.{commit_date.strftime('%Y%m%d')}.dev{commit_count}"
+
+
+def does_pypi_version_exist(base_url: str, package: str, version: str) -> bool:
+    base_url = base_url.removesuffix("/")
+    version = version.replace(".", "\\.")
+
+    body = requests.get(f"{base_url}/simple/{package}").text
+    return len(re.findall(rf"<a href=\".+\">{package}-{version}-.+</a>", body, re.MULTILINE)) > 0
+
+
+def main():
+    package = os.environ["PACKAGE"]
+    base_url = os.environ["BASE_URL"]
+    repository = os.environ["REPOSITORY"]
+
+    version = get_release_version(repository) if not os.environ.get("BRANCH", False) else get_unstable_version(repository, os.environ["BRANCH"]) 
+    
+    if does_pypi_version_exist(base_url, package, version):
+        sys.exit(0)
+
+    print(f"version={version}")
+
+
+if __name__ == "__main__":
+    main()
+