fix(Docker): improve build and compose files (#255)

* fix(Docker): improve build and compose files

- Adapted `Dockerfile` so the PWD will point to the `/config` folder in the image
- Modified the `docker-compose.yml` to follow the Dockerfile logic
- Added a LABEL to the docker image so it points to the source code

* refactor(Dockerfile): comment WORKDIR /config instruction

* feat(Dockerfile): move back to `/pumpkin` as root folder

Dockerfile

@@ -1,18 +1,33 @@
 FROM rust:1-alpine3.20 AS builder
 ENV RUSTFLAGS="-C target-feature=-crt-static -C target-cpu=native"
 RUN apk add --no-cache musl-dev
+
 WORKDIR /pumpkin
 COPY . /pumpkin
+
+# build release
 RUN --mount=type=cache,sharing=private,target=/pumpkin/target \
     --mount=type=cache,target=/usr/local/cargo/git/db \
     --mount=type=cache,target=/usr/local/cargo/registry/ \
     cargo build --release && cp target/release/pumpkin ./pumpkin.release
+
+# strip debug symbols from binary
 RUN strip pumpkin.release
 
 FROM alpine:3.20
-WORKDIR /pumpkin
+
+# Identifying information for registries like ghcr.io
+LABEL org.opencontainers.image.source=https://github.com/Snowiiii/Pumpkin
+
 RUN apk add --no-cache libgcc
-COPY --from=builder /pumpkin/pumpkin.release /pumpkin/pumpkin
+
+COPY --from=builder /pumpkin/pumpkin.release /bin/pumpkin
+
+# set workdir to /pumpkin, this is required to influence the PWD environment variable
+# it allows for bind mounting the server files without overwriting the pumpkin
+# executable (without requiring an `docker cp`-ing the binary to the host folder)
+WORKDIR /pumpkin
+
 ENV RUST_BACKTRACE=1
 EXPOSE 25565
-ENTRYPOINT ["/pumpkin/pumpkin"]
+ENTRYPOINT [ "/bin/pumpkin" ]