[Docker image] Change base image to Google Container Tools 'distroless'

application/Dockerfile

@@ -9,7 +9,7 @@ RUN go mod download -x
 COPY . .
 RUN CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gpts -ldflags "-X 'main.version=${BUILD_VERSION}' -X 'main.gitCommit=${BUILD_GIT_COMMIT}' -X 'main.binaryType=static' -w -extldflags '-static'" .
 
-FROM alpine:latest  
+FROM gcr.io/distroless/static:latest
 LABEL maintainer "Piotr Icikowski <[email protected]>"
 LABEL org.opencontainers.image.title "GPTS - General Purpose Test Service"
 LABEL org.opencontainers.image.description "Simple & easy to configure test service for serving content through HTTP"
@@ -18,10 +18,7 @@ LABEL org.opencontainers.image.vendor "Piotr Icikowski"
 LABEL org.opencontainers.image.url "https://github.com/Icikowski/GPTS"
 LABEL org.opencontainers.image.source "https://github.com/Icikowski/GPTS"
 LABEL org.opencontainers.image.licenses "GPL-3.0-or-later"
-RUN apk --no-cache add ca-certificates
-RUN adduser app -u 1000 -h /app -S -D
-WORKDIR /app/
+WORKDIR /
 COPY --from=builder /app/gpts .
-RUN chmod a+x gpts
-USER 1000
-CMD ["./gpts"] 
+USER 65532:65532
+ENTRYPOINT ["/gpts"]