change workflow names, ids; use commit hash for image tag

.gitea/workflows/deploy.yml

@@ -1,4 +1,4 @@
-name: Deployment
+name: Build and Push Docker Image
 
 on:
   push:
@@ -7,13 +7,13 @@ on:
   workflow_dispatch:
 
 jobs:
-  deploy-site:
-    name: 'deploy'
+  build-and-push-image:
+    name: 'Docker Build and Push'
     env:
       REGISTRY_USERNAME: nicholas
       IMAGE_REGISTRY: git.uuard.com
       IMAGE_NAME: nicholas/proving-ground
-      IMAGE_TAG: tonga
+      IMAGE_TAG: ${{ github.sha }}
     runs-on: ubuntu-latest
     steps:
       - name: ⬇️ Checkout repo