docker: switch to wolfi base images (#5)

Use wolfi base image.

---------

Signed-off-by: Max Englander <max@planetscale.com>

Author: maxenglander

Dockerfile

@@ -1,12 +1,14 @@
-ARG ARCH="amd64"
-ARG OS="linux"
-FROM quay.io/prometheus/busybox-${OS}-${ARCH}:latest
-LABEL maintainer="The Prometheus Authors <prometheus-developers@googlegroups.com>"
+FROM --platform=$BUILDPLATFORM pscale.dev/wolfi-prod/go:1.23 AS build
+ARG TARGETOS
+ARG TARGETARCH
+RUN apk --no-cache add curl
+COPY . /postgres_exporter
+RUN rm -f /postgres_exporter/postgres_exporter
+RUN CGO_ENABLED=0 GOOS="$TARGETOS" GOARCH="$TARGETARCH" make -C /postgres_exporter build
 
-ARG ARCH="amd64"
-ARG OS="linux"
-COPY .build/${OS}-${ARCH}/postgres_exporter /bin/postgres_exporter
-
-EXPOSE     9187
-USER       nobody
-ENTRYPOINT [ "/bin/postgres_exporter" ]
+FROM pscale.dev/wolfi-prod/base:latest
+COPY --from=build /postgres_exporter/postgres_exporter /bin/postgres_exporter
+EXPOSE 9187
+USER nobody
+WORKDIR /
+ENTRYPOINT ["/bin/postgres_exporter"]