Add Dockerfile

Dockerfile

@@ -0,0 +1,21 @@
+# syntax=docker/dockerfile:1
+
+FROM golang:1.18-alpine
+
+# hadolint ignore=DL3018
+RUN apk --no-cache add \
+  gcc \
+  musl-dev
+
+WORKDIR /app
+
+COPY backend/ .
+
+RUN  CGO_ENABLED=1 GOOS=linux \
+    go build -o /rfd-fyi \
+    # Additional flags are necessary for sqlite support
+    -a -ldflags '-linkmode external -extldflags "-static"' .
+
+EXPOSE 8080
+
+CMD [ "/rfd-fyi" ]