feat: Sets up ci workflows

.gitea/workflows/ci.yml

@@ -0,0 +1,20 @@
+name: CI
+
+on:
+  push:
+  workflow_dispatch:
+
+jobs:
+  ubuntu:
+    name: Ubuntu
+    runs-on: ubuntu-22.04
+    steps:
+    - uses: actions/checkout@v4
+    - name: Setup just.
+      uses: https://git.housh.dev/actions/setup-just.git@v1
+    - name: Setup QEMU
+      uses: docker/setup-qemu-action@v3
+    - name: Setup buildx
+      uses: docker/setup-buildx-action@v3
+    - name: Run tests.
+      run: just test-docker