Add Docker build to CI workflow

Author: buzzkillb

.github/workflows/test.yml .github/workflows/ci.yml.github/workflows/test.yml renamed to .github/workflows/ci.yml

@@ -1,4 +1,4 @@
-name: Tests
+name: CI
 
 on:
   push:
@@ -28,3 +28,25 @@ jobs:
 
       - name: Run tests
         run: cargo test
+
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v3
+
+      - name: Build Docker image
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          load: true
+          tags: rustymcpriceface:test
+
+      - name: Verify Docker image runs
+        run: |
+          docker run -d --name test-container -e DISCORD_TOKEN_BTC=test rustymcpriceface:test
+          sleep 10
+          docker logs test-container
+          docker rm -f test-container