remove COPY app instruction

dockerfiles/cpp-23.Dockerfile

@@ -38,6 +38,3 @@ RUN if [ -d "/app/vcpkg_installed" ]; then mv /app/vcpkg_installed /app-cached/b
 
 RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && cmake -B build -S . -DCMAKE_TOOLCHAIN_FILE=${VCPKG_ROOT}/scripts/buildsystems/vcpkg.cmake && cmake --build ./build && sed -i '/^cmake/ s/^/# /' ./your_grep.sh" > /codecrafters-precompile.sh
 RUN chmod +x /codecrafters-precompile.sh
-
-# Once the heavy steps are done, we can copy all files back
-COPY . /app

dockerfiles/gleam-1.4.Dockerfile

@@ -15,6 +15,3 @@ RUN gleam build
 # Cache build directory
 RUN mkdir -p /app-cached
 RUN mv build /app-cached/build
-
-# Once the heavy steps are done, we can copy all files back
-COPY . /app

dockerfiles/kotlin-2.0.Dockerfile

@@ -11,6 +11,3 @@ COPY --exclude=.git --exclude=README.md . /app
 
 # Cache dependencies
 RUN mvn -B package -Ddir=/tmp/codecrafters-build-grep-kotlin
-
-# Once the heavy steps are done, we can copy all files back
-COPY . /app

dockerfiles/rust-1.62.Dockerfile

@@ -17,4 +17,3 @@ RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && cargo build --release --target-d
 RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Cargo.toml,Cargo.lock"
-

dockerfiles/rust-1.68.Dockerfile

@@ -17,4 +17,3 @@ RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && cargo build --release --target-d
 RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Cargo.toml,Cargo.lock"
-

dockerfiles/rust-1.70.Dockerfile

@@ -17,4 +17,3 @@ RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && cargo build --release --target-d
 RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Cargo.toml,Cargo.lock"
-

dockerfiles/rust-1.76.Dockerfile

@@ -17,4 +17,3 @@ RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && cargo build --release --target-d
 RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Cargo.toml,Cargo.lock"
-

dockerfiles/rust-1.77.Dockerfile

@@ -16,6 +16,3 @@ RUN echo "cd \${CODECRAFTERS_SUBMISSION_DIR} && cargo build --release --target-d
 RUN chmod +x /codecrafters-precompile.sh
 
 ENV CODECRAFTERS_DEPENDENCY_FILE_PATHS="Cargo.toml,Cargo.lock"
-
-# Once the heavy steps are done, we can copy all files back
-COPY . /app