Add frontend and backend dockerfile

Dockerfile

@@ -0,0 +1,44 @@
+FROM node:alpine as frontend
+
+RUN yarn global add elm elm-test
+
+COPY ./frontend/elm.json ./elm.json
+COPY ./frontend/src ./src
+COPY ./frontend/tests ./tests
+
+RUN elm make src/Main.elm
+
+
+FROM ekidd/rust-musl-builder:stable as backend
+
+# create new cargo project
+RUN USER=rust cargo init --bin
+# copy build config
+COPY --chown=rust ./backend/Cargo.lock ./Cargo.lock
+COPY --chown=rust ./backend/Cargo.toml ./Cargo.toml
+# build to cache dependencies
+RUN cargo build --release
+# delete build cache to prevent caching issues later on
+RUN rm -r ./target/x86_64-unknown-linux-musl/release/.fingerprint/gitache-*
+
+COPY ./backend/static ./static
+COPY ./backend/src ./src
+# build source code
+RUN cargo build --release
+
+
+# create /etc/password for rootless scratch container
+FROM alpine:latest as user_builder
+RUN USER=root adduser -D -u 10001 dummy
+
+FROM scratch
+
+# copy certificates
+COPY --from=linuxkit/ca-certificates:v0.7 / /
+COPY --from=user_builder /etc/passwd /etc/passwd
+USER dummy
+
+COPY --from=backend /home/rust/src/target/x86_64-unknown-linux-musl/release/gitache /
+COPY --from=frontend /index.html /public/
+
+ENTRYPOINT ["/gitache"]