Update Dockerfile to build cc65 and populate CC65_SOURCE_DIR with bui…

…ld tree

.devcontainer/Dockerfile

@@ -1,6 +1,16 @@
 FROM mcr.microsoft.com/devcontainers/rust:1-1-bullseye
 
-ENV BUILD_DIR="/tmp"
-ENV CC65_VERSION="V2.19"
+ENV BUILD_DIR="/cc65-src"
+ENV CC65_VERSION="2.19"
+ENV CC65_DOWNLOAD_VERSION="V2.19"
+ENV PREFIX="/usr/local"
+ENV CC65_SOURCE_DIR="${BUILD_DIR}/cc65-${CC65_VERSION}"
 
-RUN apt-get update && apt-get install build-essential cc65 -y
+RUN apt-get update && apt-get install build-essential -y && \
+    mkdir -p ${BUILD_DIR} && \
+    cd ${BUILD_DIR} && \
+    wget https://github.com/cc65/cc65/archive/${CC65_DOWNLOAD_VERSION}.tar.gz && \
+    tar xzf ${CC65_DOWNLOAD_VERSION}.tar.gz && \
+    cd cc65* && \
+    make && \
+    make install