🔨 Add workflow & dockerfile

Dockerfile

@@ -0,0 +1,15 @@
+# Building Backend
+FROM golang:alpine as roadsign-server
+
+WORKDIR /source
+COPY . .
+RUN CGO_ENABLED=0 GOOS=linux GOARCH=amd64 go build -o /dist ./pkg/cmd/main.go
+
+# Runtime
+FROM golang:alpine
+
+COPY --from=roadsign-server /dist /roadsign/server
+
+EXPOSE 81
+
+CMD ["/roadsign/server"]