Add action to build backend image.

.github/workflows/docker.yml

@@ -0,0 +1,17 @@
+name: Generate Docker Containers
+
+on:
+  push:
+    tags:
+      - '*'
+
+jobs:
+  backend:
+    name: Build backend image
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Build image
+        working-directory: backend
+        run: docker build -t daemontus/bbm-backend .
+

backend/Dockerfile

@@ -0,0 +1,15 @@
+# Container is based on Alpine linux with node.js preinstalled.
+FROM node:alpine 
+WORKDIR /usr/mynodeapp
+
+# Copy backend files.
+COPY ./ ./
+
+# Install project dependencies.
+RUN npm install
+
+# The port on which the backend is running.
+EXPOSE 3000
+
+# Run server.
+CMD ["npm", "start"]