Add SCCache to help reuse artifacts

Author: rblaine95

Dockerfile

@@ -10,7 +10,9 @@ RUN apt-get update && \
       git \
       libclang-dev \
       make \
-      protobuf-compiler
+      protobuf-compiler \
+      pkg-config \
+      libssl-dev
 
 ENV CARGO_NET_GIT_FETCH_WITH_CLI=true
 RUN rustup target add wasm32v1-none
@@ -20,6 +22,10 @@ RUN rustup target add wasm32v1-none
 RUN rustup target add wasm32-unknown-unknown
 RUN rustup component add rust-src
 
+RUN cargo install sccache
+ENV RUSTC_WRAPPER=/usr/local/cargo/bin/sccache
+ENV SCCACHE_DIR=/opt/polkadot-sdk/.sccache
+
 WORKDIR /opt
 ARG VERSION=stable2509
 RUN git clone https://github.com/paritytech/polkadot-sdk.git -b polkadot-$VERSION --depth 1