diff --git a/.forgejo/workflows/docker.yaml b/.forgejo/workflows/docker.yaml
new file mode 100644
index 0000000..14c8395
--- /dev/null
+++ b/.forgejo/workflows/docker.yaml
@@ -0,0 +1,20 @@
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  build:
+    runs-on: docker
+    container:
+      image: ubuntu:24.04
+    steps:
+      - name: Install dependencies
+        run: apt-get update -q && apt-get install -qy git nodejs buildah
+
+      - uses: actions/checkout@v4
+
+      - name: Build and push Docker image
+        run: |
+          buildah build -t kalendasz:latest
+          buildah push --creds ${{ gitea.actor }}:${{ secrets.PUSH_PACKAGES_KEY }} kalendasz:latest "docker://git.hswro.org/kosma/kalendasz:latest"
diff --git a/.gitignore b/.gitignore
index 5b6b072..10badd2 100644
--- a/.gitignore
+++ b/.gitignore
@@ -1 +1,2 @@
 config.yaml
+/venv/
diff --git a/app.py b/app.py
index a2a25e5..890c0c6 100644
--- a/app.py
+++ b/app.py
@@ -2,6 +2,7 @@ import argparse
 import base64
 import json
 import secrets
+from urllib.parse import urlencode
 
 import yaml
 from cryptography.hazmat.primitives import serialization
@@ -46,8 +47,7 @@ def authorize():
         "nonce": nonce,
         "public_key": public_key,
     }
-    query = "&".join(f"{k}={v}" for k, v in params.items())
-    return redirect(f"{config['forum_url']}/user-api-key/new?{query}")
+    return redirect(f"{config['forum_url']}/user-api-key/new?{urlencode(params)}")
 
 
 @app.route("/callback")