Use catthehacker's Ubuntu image to run deploy job

.gitea/workflows/build-and-deploy.yaml

@@ -1,13 +1,10 @@
 name: Build and deploy
-run-name: ${{ gitea.actor }} is testing out Gitea Actions 🚀
 on: [push]
 
 jobs:
-  Explore-Gitea-Actions:
-    runs-on: ubuntu-latest
+  Build-And-Deploy:
+    runs-on: ubuntu-latest:docker://catthehacker/ubuntu:act-latest
     steps:
-      - name: Install Docker
-        run: curl -fsSL https://get.docker.com | sh
       - name: Check out repository code
         uses: actions/checkout@v3
       - name: Build Docker image