Add internal project dependency to Dockerfile

Dockerfile

@@ -38,6 +38,7 @@ RUN USER=root cargo new --bin ${PROJECT_NAME}
 WORKDIR ${WORKDIR_ROOT}/${PROJECT_NAME}
 
 RUN USER=root cargo new --lib ofdb-boundary
+RUN USER=root cargo new --lib ofdb-entities
 
 COPY [ \
     "Cargo.toml", \
@@ -46,6 +47,9 @@ COPY [ \
 COPY [ \
     "ofdb-boundary/Cargo.toml", \
     "./ofdb-boundary/" ]
+COPY [ \
+    "ofdb-entities/Cargo.toml", \
+    "./ofdb-entities/" ]
 
 # Build the dummy project(s), then delete all build artefacts that must(!) not be cached
 RUN cargo build --${BUILD_MODE} --target ${BUILD_TARGET} --workspace \
@@ -56,9 +60,13 @@ RUN cargo build --${BUILD_MODE} --target ${BUILD_TARGET} --workspace \
     && \
     rm -f ./target/${BUILD_TARGET}/${BUILD_MODE}/deps/ofdb_boundary-* \
     && \
+    rm -f ./target/${BUILD_TARGET}/${BUILD_MODE}/deps/ofdb_entities-* \
+    && \
     rm -rf ./target/${BUILD_TARGET}/${BUILD_MODE}/.fingerprint/${PROJECT_NAME}-* \
     && \
-    rm -rf ./target/${BUILD_TARGET}/${BUILD_MODE}/.fingerprint/ofdb-boundary-*
+    rm -rf ./target/${BUILD_TARGET}/${BUILD_MODE}/.fingerprint/ofdb-boundary-* \
+    && \
+    rm -rf ./target/${BUILD_TARGET}/${BUILD_MODE}/.fingerprint/ofdb-entities-*
 
 # Copy all project (re-)sources that are required for building
 COPY [ \
@@ -70,6 +78,9 @@ COPY [ \
 COPY [ \
     "ofdb-boundary/src", \
     "./ofdb-boundary/src/" ]
+COPY [ \
+    "ofdb-entities/src", \
+    "./ofdb-entities/src/" ]
 COPY [ \
     "openapi.yaml", \
     "./" ]