docker: Further optimize multi-layered build.

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

docker/Dockerfile.cargo.deb

@@ -13,6 +13,9 @@ ARG cargo_spec_features
 ARG pkg_dir
 ARG deb_args=""
 
+WORKDIR /
+COPY --link --from=input . .
+
 WORKDIR /usr/src/tuwunel
 RUN \
 --mount=type=cache,dst=${RUSTUP_HOME},sharing=locked \

docker/Dockerfile.cargo.deps

@@ -18,7 +18,7 @@ WORKDIR /usr/lib/${sys_target}
 COPY --from=rocksdb . .
 
 WORKDIR /usr/src/tuwunel
-COPY --link --from=recipe recipe.json .
+COPY --from=recipe recipe.json .
 
 ENV CARGO_BUILD_RUSTFLAGS=${CARGO_BUILD_RUSTFLAGS}
 RUN \

docker/Dockerfile.cargo.rpm

@@ -13,6 +13,9 @@ ARG cargo_spec_features
 ARG pkg_dir
 ARG gen_rpm_args=""
 
+WORKDIR /
+COPY --link --from=input . .
+
 WORKDIR /usr/src/tuwunel
 RUN \
 --mount=type=cache,dst=${RUSTUP_HOME},sharing=locked \

docker/Dockerfile.cookware

@@ -8,6 +8,9 @@ ARG CARGO_TARGET
 ARG rustup_version="1.28.1"
 ARG rustup_components
 
+WORKDIR /
+COPY --link --from=input . .
+
 WORKDIR /opt
 RUN \
 --mount=type=cache,dst=${RUSTUP_HOME},sharing=locked \
@@ -50,6 +53,9 @@ ARG CARGO_HOME
 ARG CARGO_TARGET
 ARG cargo_installs
 
+WORKDIR /
+COPY --link --from=input . .
+
 RUN \
 --mount=type=cache,dst=${RUSTUP_HOME},sharing=locked \
 --mount=type=cache,dst=${CARGO_HOME},sharing=locked \

docker/Dockerfile.diner

@@ -11,6 +11,9 @@ ARG var_cache
 ARG var_lib_apt
 ARG packages
 
+WORKDIR /
+COPY --link --from=input . .
+
 ENV packages="ca-certificates ${packages}"
 RUN \
 --mount=type=cache,dst=${var_cache},sharing=locked \
@@ -31,6 +34,9 @@ FROM input AS valgrind
 ARG var_cache
 ARG var_lib_apt
 
+WORKDIR /
+COPY --link --from=input . .
+
 RUN \
 --mount=type=cache,dst=${var_cache},sharing=locked \
 --mount=type=cache,dst=${var_lib_apt},sharing=locked \
@@ -44,6 +50,9 @@ FROM input AS perf
 ARG var_cache
 ARG var_lib_apt
 
+WORKDIR /
+COPY --link --from=input . .
+
 RUN \
 --mount=type=cache,dst=${var_cache},sharing=locked \
 --mount=type=cache,dst=${var_lib_apt},sharing=locked \

docker/Dockerfile.ingredients

@@ -22,6 +22,9 @@ ARG CARGO_HOME
 ARG CARGO_TARGET
 ARG CARGO_TERM_VERBOSE=0
 
+WORKDIR /
+COPY --link --from=input . .
+
 WORKDIR /usr/src/tuwunel
 COPY --link --from=source /usr/src/tuwunel .
 

docker/Dockerfile.kitchen

@@ -21,6 +21,9 @@ xz-utils \
 ${packages} \
 "
 
+WORKDIR /
+COPY --link --from=input . .
+
 RUN  \
 --mount=type=cache,dst=${var_cache},sharing=locked \
 --mount=type=cache,dst=${var_lib_apt},sharing=locked \