feat: move to distroless docker image

Dockerfile

@@ -1,22 +1,11 @@
-FROM golang:1.20
+FROM golang:1.20 as build
 
-# Set destination for COPY
-WORKDIR /app
+WORKDIR /go/src/app
+COPY . .
 
-# Copy the source code. Note the slash at the end, as explained in
-# https://docs.docker.com/engine/reference/builder/#copy
-COPY . ./
-
-# Build
 RUN go mod download
-RUN CGO_ENABLED=0 GOOS=linux go build -o /filehole
+RUN CGO_ENABLED=0 go build -o /go/bin/filehole
 
-# Optional:
-# To bind to a TCP port, runtime parameters must be supplied to the docker command.
-# But we can document in the Dockerfile what ports
-# the application is going to listen on by default.
-# https://docs.docker.com/engine/reference/builder/#expose
-EXPOSE 8000
-
-# Run
+FROM gcr.io/distroless/static-debian12
+COPY --from=build /go/bin/filehole /
 CMD ["/filehole", "serve"]