🐛 fix: Cache the runner image to reduce build time

.github/workflows/runner.yml

@@ -41,6 +41,14 @@ jobs:
             - 
               name: Setup Docker Buildx
               uses: docker/setup-buildx-action@v3
+            - 
+              name: Cache Docker layers
+              uses: actions/cache@v4
+              with:
+                path: /tmp/.buildx-cache
+                key: ${{ runner.os }}-buildx-${{ github.sha }}
+                restore-keys: |
+                  ${{ runner.os }}-buildx-
             - 
               name: Build Docker image
               uses: docker/build-push-action@v5
@@ -49,7 +57,14 @@ jobs:
                 context: ./
                 push: false
                 load: true
+                cache-from: type=local,src=/tmp/.buildx-cache
+                cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
                 tags: nestri:runner
+            -
+              name: Move cache
+              run: |
+                rm -rf /tmp/.buildx-cache
+                mv /tmp/.buildx-cache-new /tmp/.buildx-cache 
 
     build-docker-main:
         name: Build image on main
@@ -83,12 +98,27 @@ jobs:
                   type=semver,pattern={{version}}
                   type=semver,pattern={{major}}.{{minor}}
                   type=semver,pattern={{major}}
+            - 
+              name: Cache Docker layers
+              uses: actions/cache@v4
+              with:
+                path: /tmp/.buildx-cache
+                key: ${{ runner.os }}-buildx-${{ github.sha }}
+                restore-keys: |
+                  ${{ runner.os }}-buildx-
             - 
               name: Build Docker image
               uses: docker/build-push-action@v5
               with:
                 file:  containers/runner.Containerfile
                 context: ./
                 push: true
+                cache-from: type=local,src=/tmp/.buildx-cache
+                cache-to: type=local,dest=/tmp/.buildx-cache-new,mode=max
                 tags: ${{ steps.meta.outputs.tags }}
-                labels: ${{ steps.meta.outputs.labels }}
+                labels: ${{ steps.meta.outputs.labels }}
+            -
+              name: Move cache
+              run: |
+                rm -rf /tmp/.buildx-cache
+                mv /tmp/.buildx-cache-new /tmp/.buildx-cache 

containers/runner.Containerfile

@@ -13,12 +13,19 @@ RUN pacman -Syu --noconfirm meson pkgconf cmake git gcc make rustup \
 
 # Setup stable rust toolchain #
 RUN rustup default stable
-# # Clone nestri source #
+
 #Copy the whole repo inside the build container
-COPY ./ /builder/nestri/
+# COPY ./ /builder/nestri/
+
+RUN mkdir -p /artifacts
 
-RUN cd /builder/nestri/packages/server/ && \
-    cargo build --release
+RUN --mount=type=bind,target=/builder/nestri/,rw \
+    --mount=type=cache,target=/builder/nestri/target/   \
+    --mount=type=cache,target=/usr/local/cargo/git/db \
+    --mount=type=cache,target=/usr/local/cargo/registry/ \
+    cd /builder/nestri/packages/server/ \
+    && cargo build --release \
+    && cp /builder/nestri/target/release/nestri-server /artifacts/
 
 #******************************************************************************
 #                                                                                                            gstwayland-builder
@@ -33,15 +40,28 @@ RUN pacman -Syu --noconfirm meson pkgconf cmake git gcc make rustup \
 # Setup stable rust toolchain #
 RUN rustup default stable
 # Build required cargo-c package #
-RUN cargo install cargo-c
+RUN --mount=type=cache,target=/usr/local/cargo/git/db \
+    --mount=type=cache,target=/usr/local/cargo/registry/ \
+    --mount=type=cache,target=/root/.cargo/bin/ \
+    cargo install cargo-c
+
 # Clone gst plugin source #
 RUN git clone https://github.com/games-on-whales/gst-wayland-display.git
 
 # Build gst plugin #
-RUN mkdir plugin && \
-	cd gst-wayland-display && \
-	cargo cinstall --prefix=/builder/plugin/
+RUN mkdir plugin
 
+RUN mkdir -p /artifacts
+
+WORKDIR /builder/gst-wayland-display
+
+RUN --mount=type=cache,target=/builder/gst-wayland-display/target/  \
+    --mount=type=cache,target=/root/.cargo/bin/ \
+    --mount=type=cache,target=/builder/plugin/  \
+    --mount=type=cache,target=/usr/local/cargo/git/db \
+    --mount=type=cache,target=/usr/local/cargo/registry/ \
+	cargo cinstall --prefix=/builder/plugin/ \
+    && cp -r /builder/plugin/ /artifacts/
 
 #******************************************************************************
 #                                                                                                                             runtime
@@ -63,7 +83,6 @@ RUN pacman -Syu --noconfirm --needed \
     # Clean up pacman cache
     paccache -rk1
 
-
 ## User ##
 # Create and setup user #
 ENV USER="nestri" \
@@ -90,13 +109,13 @@ RUN usermod -aG input root && usermod -aG input ${USER} && \
 ## Copy files from builders ##
 # this is done here at end to not trigger full rebuild on changes to builder
 # nestri
-COPY --from=gst-builder /builder/nestri/target/release/nestri-server /usr/bin/nestri-server
+COPY --from=gst-builder /artifacts/nestri-server /usr/bin/nestri-server
 # gstwayland
-COPY --from=gstwayland-builder /builder/plugin/include/libgstwaylanddisplay /usr/include/
-COPY --from=gstwayland-builder /builder/plugin/lib/*libgstwayland* /usr/lib/
-COPY --from=gstwayland-builder /builder/plugin/lib/gstreamer-1.0/libgstwayland* /usr/lib/gstreamer-1.0/
-COPY --from=gstwayland-builder /builder/plugin/lib/pkgconfig/gstwayland* /usr/lib/pkgconfig/
-COPY --from=gstwayland-builder /builder/plugin/lib/pkgconfig/libgstwayland* /usr/lib/pkgconfig/
+COPY --from=gstwayland-builder /artifacts/plugin/include/libgstwaylanddisplay /usr/include/
+COPY --from=gstwayland-builder /artifacts/plugin/lib/*libgstwayland* /usr/lib/
+COPY --from=gstwayland-builder /artifacts/plugin/lib/gstreamer-1.0/libgstwayland* /usr/lib/gstreamer-1.0/
+COPY --from=gstwayland-builder /artifacts/plugin/lib/pkgconfig/gstwayland* /usr/lib/pkgconfig/
+COPY --from=gstwayland-builder /artifacts/plugin/lib/pkgconfig/libgstwayland* /usr/lib/pkgconfig/
 
 ## Copy scripts ##
 COPY packages/scripts/ /etc/nestri/