docker: Refactor feat_set out of base layers.

Signed-off-by: Jason Volk <jason@zemos.net>

docker/Dockerfile.source

@@ -0,0 +1,104 @@
+# syntax = docker/dockerfile:1.11-labs
+
+FROM input AS source
+ARG git_checkout
+
+WORKDIR /
+COPY --link --from=input . .
+
+ADD --link --keep-git-dir . /usr/src/tuwunel
+WORKDIR /usr/src/tuwunel
+RUN <<EOF
+    set -eux
+    git reset \
+        --hard \
+        --no-recurse-submodules \
+        ${git_checkout}
+EOF
+
+
+FROM input AS ingredients
+ARG sys_target
+ARG rust_target
+ARG rust_toolchain
+ARG RUST_HOME
+ARG RUSTUP_HOME
+ARG CARGO_HOME
+ARG CARGO_TARGET
+ARG CARGO_TERM_VERBOSE=0
+ARG RUST_BACKTRACE
+ARG JEMALLOC_OVERRIDE
+#ARG ZSTD_SYS_USE_PKG_CONFIG=0
+ARG ROCKSDB_LIB_DIR
+
+WORKDIR /
+COPY --link --from=input . .
+
+WORKDIR /
+COPY --link --from=rust ${RUST_HOME} ${RUST_HOME}
+
+WORKDIR /usr/src/tuwunel
+COPY --link --from=source /usr/src/tuwunel .
+
+ENV PATH="${CARGO_HOME}/bin:$PATH"
+ENV CARGO_TERM_VERBOSE="${CARGO_TERM_VERBOSE}"
+ENV RUST_BACKTRACE="${RUST_BACKTRACE}"
+ENV JEMALLOC_OVERRIDE="${JEMALLOC_OVERRIDE}"
+#ENV ZSTD_SYS_USE_PKG_CONFIG="${ZSTD_SYS_USE_PKG_CONFIG}"
+ENV ROCKSDB_LIB_DIR="${ROCKSDB_LIB_DIR}"
+RUN \
+--mount=type=cache,dst=${RUSTUP_HOME}/downloads,sharing=locked \
+--mount=type=cache,dst=${CARGO_HOME}/registry,sharing=locked \
+--mount=type=cache,dst=${CARGO_HOME}/git,sharing=locked \
+<<EOF
+    set -eux
+    git submodule update \
+        --remote \
+        --no-fetch \
+        --recursive \
+        --checkout \
+        --init
+
+    rustup run ${rust_toolchain} \
+        cargo fetch \
+            --locked \
+            --target ${CARGO_TARGET}
+EOF
+
+
+FROM input AS preparing
+ARG rust_target
+ARG rust_toolchain
+ARG RUSTUP_HOME
+ARG CARGO_HOME
+ARG CARGO_TARGET
+
+WORKDIR /
+COPY --link --from=input . .
+
+WORKDIR /usr/src/tuwunel
+RUN \
+--mount=type=cache,dst=${RUSTUP_HOME}/downloads,sharing=locked \
+--mount=type=cache,dst=${CARGO_HOME}/registry,sharing=locked \
+--mount=type=cache,dst=${CARGO_HOME}/git,sharing=locked \
+<<EOF
+    set -euxo pipefail
+    rustup run ${rust_toolchain} \
+        cargo chef prepare \
+            --recipe-path recipe.json
+
+    manifest="Cargo.toml"
+    package="rust-librocksdb-sys"
+    cmd="cargo tree --manifest-path ${manifest} -f {r} -p ${package}"
+    url="$(rustup run ${rust_toolchain} ${cmd} | head -n 1)"
+    echo "$url" > rocksdb.url
+
+    sha1sum recipe.json rocksdb.url
+EOF
+
+
+FROM scratch AS recipe
+
+WORKDIR /
+COPY --from=preparing /usr/src/tuwunel/recipe.json .
+COPY --from=preparing /usr/src/tuwunel/rocksdb.url .