build: adding Codeberg sync

.github/workflows/codeberg-mirror.yml

@@ -0,0 +1,18 @@
+name: Codeberg Sync
+on:
+  push:
+    branches:
+    - '**'
+
+jobs:
+  codeberg:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v3
+      with:
+        fetch-depth: 0
+    - uses: yesolutions/mirror-action@master
+      with:
+        REMOTE: [email protected]:arcuru/pokem.git
+        GIT_SSH_PRIVATE_KEY: ${{ secrets.GIT_SSH_PRIVATE_KEY }}
+        GIT_SSH_NO_VERIFY_HOST: "true"

README.md

@@ -15,6 +15,10 @@ It is built using [headjack](https://github.com/arcuru/headjack), a Matrix bot f
 If this seems familiar, that's because it's a clone of the core feature of [ntfy.sh](https://ntfy.sh), but only using Matrix.
 I'd encourage you to check out that project to see if it better suits your needs.
 
+## Repository
+
+**Mirrored on [GitHub](https://github.com/arcuru/pokem) and [Codeberg](https://codeberg.org/arcuru/pokem). GitHub is the official repo, but use either repo to contribute. Issues can't be synced so there may be some duplicates.**
+
 ## Getting Help
 
 There is a public Matrix room available at [#pokem:jackson.dev](https://matrix.to/#/#pokem:jackson.dev)