chore: use installed packages when available

.github/docker/Dockerfile

@@ -53,9 +53,20 @@ ENV LANG=en_US.UTF-8
 RUN git config --global --add safe.directory '*'
 
 
-# Install latest stable Rust toolchain (rocker images may ship an outdated version)
-RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y
-ENV PATH="/root/.cargo/bin:${PATH}"
+# Install latest stable Rust toolchain into fixed, $HOME-independent paths so
+# that pak can find cargo regardless of the HOME GitHub Actions injects at runtime.
+ENV RUSTUP_HOME=/usr/local/rustup \
+    CARGO_HOME=/usr/local/cargo
+RUN curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs \
+    | sh -s -- -y --no-modify-path
+ENV PATH="/usr/local/cargo/bin:${PATH}"
+
+# Register Rust with dpkg so pkgdepends' bundled sysreqs DB treats it as
+# already installed and skips any apt/rustup install attempts at runtime.
+RUN RUSTC_VER=$(rustc --version | awk '{print $2}') \
+    && CARGO_VER=$(cargo --version | awk '{print $2}') \
+    && printf 'Package: rustc\nStatus: install ok installed\nArchitecture: amd64\nVersion: %s\nDescription: stub; real Rust managed by rustup\n\nPackage: cargo\nStatus: install ok installed\nArchitecture: amd64\nVersion: %s\nDescription: stub; real Rust managed by rustup\n\n' \
+       "$RUSTC_VER" "$CARGO_VER" >> /var/lib/dpkg/status
 
 # Rocker images configure repos to PPM's Linux binary endpoint, which doesn't
 # index packages needing non-standard build tools (e.g. Rust). Add CRAN source
@@ -71,6 +82,13 @@ RUN Rscript -e 'install.packages("pak")'
 COPY install-packages.R /tmp/install-packages.R
 RUN Rscript /tmp/install-packages.R && rm /tmp/install-packages.R
 
+# Use pkgdepends' bundled sysreqs DB at runtime rather than downloading the
+# live r-hub DB. The live DB's Rust rule runs rustup unconditionally (empty
+# packages list bypasses the dpkg check), which fails inside GHA containers
+# where HOME is remapped. The bundled DB uses a proper dpkg-based check.
+# Rebuild the image with a newer pkgdepends to pick up bundled DB updates.
+ENV PKG_SYSREQS_DB_UPDATE=false
+
 # GitHub Copilot's injected "Prepare Copilot" step uses `set -o pipefail` via
 # `shell: sh`, which dash (Debian's default /bin/sh) doesn't support.  Redirect
 # /bin/sh to bash, which is already installed and is a superset of POSIX sh.

.github/workflows/copilot-setup-steps.yml

@@ -15,7 +15,6 @@ jobs:
   # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
   copilot-setup-steps:
     runs-on: ubuntu-latest
-    container: ghcr.io/api2r/pkgskills-ci:release
 
     permissions:
       contents: read
@@ -25,7 +24,6 @@ jobs:
 
       - uses: ./.github/workflows/install
         with:
-          use-container: "true"
           token: ${{ secrets.GITHUB_TOKEN }}
           cache-version: copilot
           needs: build, check, website

.github/workflows/install/action.yml

@@ -39,10 +39,6 @@ runs:
     - if: inputs.use-container != 'true'
       uses: r-lib/actions/setup-pandoc@v2
 
-    # Always run setup-r, even in containers.  With install-r: false it
-    # skips the R download but still sets R_LIBS_USER, TZ, NOT_CRAN, etc.
-    # in GITHUB_ENV — the official way to align the environment for
-    # setup-r-dependencies and actions/cache.
     - uses: r-lib/actions/setup-r@v2
       with:
         install-r: ${{ inputs.use-container != 'true' }}
@@ -62,7 +58,34 @@ runs:
         mkdir -p "$lib"
         touch "$lib/.keep"
 
-    - uses: r-lib/actions/setup-r-dependencies@v2
+    # Container path: call pak::pak() directly so it checks .libPaths() and
+    # only installs/updates packages that are genuinely missing or outdated.
+    # setup-r-dependencies always runs a full lockfile-create → lockfile-install
+    # cycle which reinstalls everything even when the container already has it.
+    - if: inputs.use-container == 'true'
+      name: Update R package dependencies (container)
+      shell: Rscript {0}
+      env:
+        GITHUB_PAT: ${{ inputs.token }}
+      run: |
+        # Replicate needs → Config/Needs/<field> expansion from r-lib/actions
+        needs_parts <- strsplit("${{ inputs.needs }}", "[[:space:],]+")[[1]]
+        needs_parts <- needs_parts[nzchar(needs_parts)]
+        needs <- sprintf("Config/Needs/%s", needs_parts)
+
+        extra_deps <- strsplit("${{ inputs.extra-packages }}", "[[:space:],]+")[[1]]
+        extra_deps <- extra_deps[nzchar(extra_deps)]
+
+        pak::pak(
+          c("deps::.", extra_deps),
+          dependencies = c(needs, "all"),
+          upgrade = TRUE,
+          ask = FALSE
+        )
+
+    # Non-container path: standard setup-r-dependencies flow with caching.
+    - if: inputs.use-container != 'true'
+      uses: r-lib/actions/setup-r-dependencies@v2
       env:
         GITHUB_PAT: ${{ inputs.token }}
       with:

NEWS.md

@@ -1,6 +1,5 @@
 # pkgskills (development version)
 
-* `use_github_copilot()` now installs a container-based `copilot-setup-steps.yml` for faster agent startup (#67).
 * `AGENTS.md` and `tdd-workflow` skill instructions now explicitly explain how to determine the GitHub issue number and warn agents never to guess or invent one (@copilot, #61).
 * `use_agent()` template is reconciled with this package's `AGENTS.md` file (#59).
 * `tdd-workflow` skill now documents `stbl::expect_pkg_error_snapshot()` with an explicit `package` argument instead of a helper-defined version (#51).

inst/templates/workflows/copilot-setup-steps.yml

@@ -15,7 +15,6 @@ jobs:
   # The job MUST be called `copilot-setup-steps` or it will not be picked up by Copilot.
   copilot-setup-steps:
     runs-on: ubuntu-latest
-    container: ghcr.io/api2r/pkgskills-ci:release
 
     permissions:
       contents: read
@@ -25,7 +24,6 @@ jobs:
 
       - uses: ./.github/workflows/install
         with:
-          use-container: "true"
           token: ${{ secrets.GITHUB_TOKEN }}
           cache-version: copilot
           needs: build, check, website