fixed docker build cache for arch-builder image

.gitea/workflows/build-arch-builder.yaml

@@ -83,6 +83,6 @@ jobs:
           pull: true
           tags: |
             "gitea.woggioni.net/woggioni/arch-builder:gitea_act_runner"
-          cache-from: type=registry,ref=gitea.woggioni.net/woggioni/arch-builder:gitea-buildx
+          cache-from: type=registry,ref=gitea.woggioni.net/woggioni/arch-builder:buildx
           cache-to: type=registry,mode=max,compression=zstd,image-manifest=true,oci-mediatypes=true,ref=gitea.woggioni.net/woggioni/arch-builder:gitea-buildx          
           target: gitea_act_runner

arch-builder/Dockerfile

@@ -95,7 +95,6 @@ RUN --mount=type=cache,target=/var/cache/pacman pacman -S --noconfirm --needed \
     protobuf     
 USER luser
 WORKDIR /home/luser
-RUN rustup update
 RUN rustup toolchain install stable-x86_64-unknown-linux-gnu --profile minimal
 RUN rustup component add rustfmt
 RUN rustup target add \
@@ -107,16 +106,14 @@ RUN rustup target add \
     aarch64-unknown-linux-gnu \
     wasm32-unknown-unknown \
     wasm32-wasip2
+RUN rustup update
 
 FROM base AS gitea_act_runner
 RUN --mount=type=cache,target=/var/cache/pacman pacman -S --noconfirm --needed nodejs npm docker docker-buildx btrfs-progs hidapi protobuf rustup llvm clang trunk emscripten
 RUN --mount=type=cache,target=/var/cache/pacman pacman -S --noconfirm --needed gitea-act-runner jdk21-graalvm-bin jdk23-graalvm-bin jdk21-graalvm-ce-bin jdk23-graalvm-ce-bin
-RUN --mount=type=cache,target=/var/cache/pacman pacman -S --noconfirm --needed sccache
 RUN --mount=type=bind,source=woggioni.net.ca.pem,target=/root.pem trust anchor root.pem
 RUN usermod -a luser -G docker
 USER luser
-WORKDIR /home/luser
-RUN rustup update
 RUN rustup toolchain install stable-x86_64-unknown-linux-gnu --profile minimal
 RUN rustup component add rustfmt
 RUN rustup target add \
@@ -128,6 +125,7 @@ RUN rustup target add \
     aarch64-unknown-linux-gnu \
     wasm32-unknown-unknown \
     wasm32-wasip2
+WORKDIR /home/luser
 RUN npm install -D wrangler
 ENV PATH="/home/luser/.local/bin:/home/luser/.cargo/bin:${PATH}"
 CMD ["/usr/lib/gitea/act_runner/act_runner", "daemon", "--config", "/var/lib/gitea/act_runner.yaml"]