OP#176 edit Dockerfilet

Dockerfile

@@ -1,11 +1,41 @@
-FROM centos:7
+# ───── Stage 1: Build the Go binary ─────
+FROM golang:1.22-alpine AS builder
 
-MAINTAINER 12ww1160 <arne@confdroid.com>
+LABEL 12ww1160 <12ww1160@confdroid.com>
 
-# Build the binary
-RUN make
-RUN make container
+# Install build tools
+RUN apk add --no-cache git make gcc musl-dev
 
-COPY start.sh /
+# Workdir = your local source
+WORKDIR /src
+COPY . .
 
-ENTRYPOINT ["/start.sh"]
+# Build exactly like the original Makefile does
+RUN make binary
+
+# Verify it works
+RUN /src/postgresql-prometheus-adapter --help
+
+
+# ───── Stage 2: Tiny runtime image ─────
+# Option A: Alpine (has glibc, easy debugging)
+# FROM alpine:3.20
+
+# Option B: Distroless (smallest & most secure) ← recommended
+FROM gcr.io/distroless/static-debian12
+
+# Copy only the binary
+COPY --from=builder /src/postgresql-prometheus-adapter /usr/local/bin/postgresql-prometheus-adapter
+
+# Optional: copy CA certificates if you use HTTPS to reach the adapter
+# (distroless already includes them)
+
+# Non-root user (same UID/GID as original Crunchy image)
+USER 1001
+
+EXPOSE 9201
+
+HEALTHCHECK --interval=30s --timeout=3s --start-period=5s --retries=3 \
+  CMD ["wget", "--no-verbose", "--tries=1", "--spider", "http://localhost:9201/health"] || exit 1
+
+ENTRYPOINT ["/usr/local/bin/postgresql-prometheus-adapter"]