OP#176 edit Dockerfile RUN step

Dockerfile

@@ -4,22 +4,20 @@ FROM golang:1.22-alpine AS builder
 RUN apk add --no-cache git make gcc musl-dev
 
 WORKDIR /src
-
-# Copy your local source (you already have it)
 COPY . .
 
-# fix go mod
+# Fix missing go.sum entries
 RUN go mod tidy
 
-# Build the binary
+# Build (default target = all)
 RUN make
 
-# Verify it was built
+# Verify binary exists and is executable — no --version check
 RUN ls -la postgresql-prometheus-adapter && \
-    ./postgresql-prometheus-adapter --version
+    ./postgresql-prometheus-adapter --help > /dev/null
 
 
-# ───── Stage 2: Tiny, secure, non-root runtime ─────
+# ───── Stage 2: Tiny runtime ─────
 FROM gcr.io/distroless/static-debian12
 
 COPY --from=builder /src/postgresql-prometheus-adapter /usr/local/bin/postgresql-prometheus-adapter