WIP: smaller docker image

Dockerfile

@@ -6,6 +6,12 @@
 ######-
 FROM golang:1.16 as builder
 
+ARG BUILD_IDENTIFIER
+ENV ENV_BUILD_IDENTIFIER=$BUILD_IDENTIFIER
+
+ARG BUILD_VERSION
+ENV ENV_BUILD_VERSION=$BUILD_VERSION
+
 RUN mkdir /build
 
 # Copy the source from the current directory to the Working Directory inside the container
@@ -17,28 +23,32 @@ WORKDIR /build
 # Workaround for failing travis-ci builds
 RUN rm -rf ~/go; rm -rf go.sum
 
+# Download dependencies
+RUN curl -L https://git.prolicht.digital/pub/healthcheck/-/releases/v1.0.1/downloads/binaries/hc -o /build/hc; \
+    chmod +rx /build/hc; \
+    echo "Building version: $ENV_BUILD_IDENTIFIER-$ENV_BUILD_VERSION"
+
 # Build the Go app
-RUN go clean -modcache; go mod tidy; make build
+RUN go clean -modcache; go mod tidy; make build-docker
 
 ######-
 # Here starts the main image
 ######-
-FROM debian:buster
+FROM scratch
 
 # Setup timezone
 ENV TZ=Europe/Vienna
 
-# GOSS for container health checks
-ENV GOSS_VERSION v0.3.16
-RUN apt-get update && apt-get upgrade -y && \
-        apt-get install --no-install-recommends -y moreutils ca-certificates curl && \
-        rm -rf /var/cache/apt /var/lib/apt/lists/*; \
-        curl -L https://github.com/aelsabbahy/goss/releases/download/$GOSS_VERSION/goss-linux-amd64 -o /usr/local/bin/goss && \
-        chmod +rx /usr/local/bin/goss && \
-        goss --version
+# Import linux stuff from builder.
+COPY --from=builder /etc/ssl/certs/ca-certificates.crt /etc/ssl/certs/
+COPY --from=builder /etc/passwd /etc/passwd
+COPY --from=builder /etc/group /etc/group
 
-COPY --from=builder /build/dist/wg-portal-amd64 /app/wgportal
-COPY --from=builder /build/scripts /app/
+# Import healthcheck binary
+COPY --from=builder /build/hc /app/hc
+
+# Copy binaries
+COPY --from=builder /build/dist/wgportal /app/wgportal
 
 # Set the Current Working Directory inside the container
 WORKDIR /app
@@ -46,5 +56,4 @@ WORKDIR /app
 # Command to run the executable
 CMD [ "/app/wgportal" ]
 
-HEALTHCHECK --interval=1m --timeout=10s \
-    CMD /app/docker-healthcheck.sh
+HEALTHCHECK --interval=30s --timeout=5s --start-period=30s --retries=3 CMD [ "/app/hc", "http://localhost:11223/health" ]