fix: Caching in Dockerfile now works properly

rust_solid_cassandra/deploy/Dockerfile

@@ -16,11 +16,12 @@ WORKDIR /backend
 COPY ../backend/Cargo.toml .
 COPY ../backend/Cargo.lock .
 RUN mkdir ./src && echo 'fn main() { println!("I am the cache-carrot"); }' > ./src/main.rs
-RUN cargo build # --release
+RUN cargo build # --release # Cache
 RUN rm -rf ./src
+# Copy over the actual app
 COPY ../backend .
+RUN touch -a -m ./src/main.rs # Modify access/modify time so it gets rebuild after cache
 # RUN cargo test # --release .
-RUN ls -lah
 RUN cargo install --path . --debug
 # ---------------------------------------------------------------------------
 #                               FRONTEND