Translate to monolithic architecture

Signed-off-by: Nikolaos Karaolidis <nick@karaolidis.com>

backend/Dockerfile

@@ -1,12 +1,23 @@
 FROM rust AS builder
+
 WORKDIR /usr/src/qrust
-COPY . .
+
 ENV SQLX_OFFLINE true
+
+RUN mkdir src && echo "fn main() {}" > src/main.rs
+COPY Cargo.toml .sqlx ./
+RUN cargo build --release
+RUN rm -rf src
+
+COPY . .
 RUN cargo build --release
 
-FROM frolvlad/alpine-glibc AS assets
-WORKDIR /usr/src/assets
-COPY --from=builder /usr/src/qrust/target/release/assets .
+FROM frolvlad/alpine-glibc AS backend
+
+WORKDIR /usr/src/qrust
+
+COPY --from=builder /usr/src/qrust/target/release/backend .
 COPY log4rs.yaml .
+
 EXPOSE 7878
-CMD ["./assets"]
+CMD ["./qrust"]