Update Dockerfile

GOG UPDATE

monitoring-as-code/Dockerfile

@@ -1,30 +1,25 @@
 # Builder image to download binaries
-FROM golang:1.19.0-alpine3.15 AS builder
+FROM golang:1.19.0-alpine3.16 AS builder
 
 # Download git, jsonnet and jsonnet-bundler
-# RUN apk add --no-cache git=2.36.2-r0 curl jq wget && \
-RUN apk add --no-cache git=2.36.2-r0 curl jq wget && \
-     go install github.com/google/go-jsonnet/cmd/[email protected] && \
+RUN apk add --no-cache git=2.36.2-r0 && \
+     go install github.com/google/go-jsonnet/cmd/[email protected] && \
      go install github.com/jsonnet-bundler/jsonnet-bundler/cmd/[email protected]
 
-# Download promtool
-RUN VERSION=$(curl -Ls https://api.github.com/repos/prometheus/prometheus/releases/latest | jq ".tag_name" | xargs | cut -c2-) &&  \
-     wget -qO- "https://github.com/prometheus/prometheus/releases/download/v${VERSION}/prometheus-$VERSION.linux-amd64.tar.gz" \
-     | tar xvzf - "prometheus-$VERSION.linux-amd64"/promtool --strip-components=1 && cp promtool /go/bin/promtool
+WORKDIR /go/grafonnet
+# Download grafonnet and grafana-builder
+RUN jb init && \
+     jb install https://github.com/grafana/grafonnet-lib/grafonnet && \
+     jb install https://github.com/grafana/jsonnet-libs/grafana-builder
 
 FROM alpine:3.16.2 AS runner
-RUN apk --no-cache add git bash
 
 # Pass semver or PR from GitHub workflow
 ARG MAC_VERSION
 ENV MAC_VERSION $MAC_VERSION
 
-# Download grafonnet and grafana-builder
 COPY --from=builder /go/bin/* /usr/local/bin/
-RUN jb init && \
-     jb install https://github.com/grafana/grafonnet-lib/grafonnet && \
-     jb install https://github.com/grafana/jsonnet-libs/grafana-builder
-
+COPY --from=builder /go/grafonnet /
 COPY src /src
 COPY mixin-defs /mixin-defs
 COPY run-mixin.sh /