Add additional support packages to Dockerfile

* Removed some unnecessary quotes
* Remove entire /opt/emsdk/downloads directory during cleanup

Dockerfile

@@ -11,9 +11,11 @@ RUN apt-get update && apt-get -y install --no-install-recommends \
     cmake \
     curl \
     gfortran \
+    gh \
     git \
     gnupg \
     gperf \
+    jq \
     libbz2-dev \
     libcurl4-openssl-dev \
     libglib2.0-dev-bin \
@@ -28,6 +30,7 @@ RUN apt-get update && apt-get -y install --no-install-recommends \
     python3 \
     quilt \
     sqlite3 \
+    sudo \
     tzdata \
     unzip \
     wget
@@ -40,16 +43,16 @@ RUN ./emsdk install "${EMSCRIPTEN_VERSION}" && \
 
 # Build LLVM flang
 COPY Makefile /root/flang-wasm/Makefile
-RUN . "/opt/emsdk/emsdk_env.sh" && \
-    cd "/root/flang-wasm" && \
+RUN . /opt/emsdk/emsdk_env.sh && \
+    cd /root/flang-wasm && \
     make PREFIX="/opt/flang" FLANG_WASM_CMAKE_VARS="-DCMAKE_C_COMPILER=clang \
         -DCMAKE_CXX_COMPILER=clang++ -DLLVM_USE_LINKER=lld" && \
     make PREFIX="/opt/flang" install
 
 # Clean up
-RUN . "/opt/emsdk/emsdk_env.sh" && emcc --clear-cache
-RUN rm -rf "/root/flang-wasm" "/opt/emsdk/downloads/*-wasm-binaries.tbz2"
-RUN apt-get clean && rm -rf "/var/lib/apt/lists/*"
+RUN . /opt/emsdk/emsdk_env.sh && emcc --clear-cache
+RUN rm -rf /root/flang-wasm /opt/emsdk/downloads/*
+RUN apt-get clean && rm -rf /var/lib/apt/lists/*
 
 # Squash docker image layers
 FROM $BASE