ci: fix Docker CGO build

Dockerfile

@@ -1,15 +1,25 @@
-FROM debian:11-slim
+FROM golang:1.19-bullseye as build
 
-RUN set -x && apt-get update && DEBIAN_FRONTEND=noninteractive apt-get install -y \
-    ca-certificates && \
-    rm -rf /var/lib/apt/lists/*
+WORKDIR /build
+COPY . .
+RUN CGO_ENABLED=1 GOOS=linux GOARCH=amd64 go build -o cic-chain-events -ldflags="-s -w" cmd/*.go
 
-WORKDIR /cic-chain-events
+FROM debian:bullseye-slim
 
-COPY cic-chain-events .
+ENV DEBIAN_FRONTEND=noninteractive
+RUN set -x && \
+    apt-get update && \
+    apt-get install -y ca-certificates && \
+    rm -rf /var/cache/apt/archives /var/lib/apt/lists/*
+
+WORKDIR /service
+
+COPY --from=build /build/cic-chain-events .
 COPY config.toml .
 COPY queries.sql .
 COPY LICENSE .
 COPY migrations migrations/
 
 CMD ["./cic-chain-events"]
+
+EXPOSE 8080