Added test workflow

.gitea/workflows/build-image.yaml

@@ -0,0 +1,15 @@
+name: Build the docker image
+run-name: Building emacs docker image.
+on: [push]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out repository code
+        uses: actions/checkout@v4
+      - name: Docker build
+        run: |
+          cd ${{ gitea.workspace }}
+          docker build . -t emacs-c
+