ci: cache runtime pack for live regression gate

Author: ferologics

.github/workflows/ci.yml

@@ -119,14 +119,54 @@ jobs:
       - name: Install pi CLI for runtime build
         run: npm install -g @mariozechner/pi-coding-agent
 
+      - name: Resolve pi CLI version
+        id: pi-version
+        run: |
+          set -euo pipefail
+          PI_VERSION=$(npm list -g @mariozechner/pi-coding-agent --depth=0 --json \
+            | node -e 'const fs = require("node:fs"); const data = JSON.parse(fs.readFileSync(0, "utf8")); process.stdout.write(data.dependencies?.["@mariozechner/pi-coding-agent"]?.version ?? "unknown");')
+          echo "version=$PI_VERSION" >> "$GITHUB_OUTPUT"
+          echo "pi_version=$PI_VERSION"
+
+      - name: Restore runtime pack cache
+        id: runtime-pack-cache
+        uses: actions/cache/restore@v4
+        with:
+          path: "~/Library/Application Support/com.pi.work/runtime"
+          key: runtime-pack-${{ runner.os }}-${{ runner.arch }}-pi-${{ steps.pi-version.outputs.version }}-${{ hashFiles('mise-tasks/runtime-build', 'runtime/init.sh', 'runtime/taskd.js') }}
+
       - name: Install dependencies
         run: pnpm install --frozen-lockfile
 
       - name: Run full live regression gate
         env:
           PIWORK_QEMU_ACCEL: tcg
+          PIWORK_RUNTIME_CACHE_HIT: ${{ steps.runtime-pack-cache.outputs.cache-hit }}
         run: mise run test-regressions
 
+      - name: Check runtime pack cache save eligibility
+        if: always()
+        id: runtime-pack-cache-ready
+        run: |
+          set -euo pipefail
+          RUNTIME_DIR="$HOME/Library/Application Support/com.pi.work/runtime"
+
+          if [[ -f "$RUNTIME_DIR/manifest.json" ]] \
+            && [[ -f "$RUNTIME_DIR/vmlinuz-virt" ]] \
+            && [[ -f "$RUNTIME_DIR/initramfs-virt-fast" ]]; then
+            echo "ready=true" >> "$GITHUB_OUTPUT"
+            exit 0
+          fi
+
+          echo "ready=false" >> "$GITHUB_OUTPUT"
+
+      - name: Save runtime pack cache
+        if: always() && steps.runtime-pack-cache.outputs.cache-hit != 'true' && steps.runtime-pack-cache-ready.outputs.ready == 'true'
+        uses: actions/cache/save@v4
+        with:
+          path: "~/Library/Application Support/com.pi.work/runtime"
+          key: runtime-pack-${{ runner.os }}-${{ runner.arch }}-pi-${{ steps.pi-version.outputs.version }}-${{ hashFiles('mise-tasks/runtime-build', 'runtime/init.sh', 'runtime/taskd.js') }}
+
       - name: Collect integration diagnostics on failure
         if: failure()
         run: |

scripts/testing/run-regressions.sh

@@ -4,8 +4,42 @@ set -euo pipefail
 ROOT_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")/../.." && pwd)
 cd "$ROOT_DIR"
 
+runtime_dir() {
+    if [[ "$(uname -s)" == "Darwin" ]]; then
+        printf '%s\n' "$HOME/Library/Application Support/com.pi.work/runtime"
+    else
+        printf '%s\n' "${XDG_DATA_HOME:-$HOME/.local/share}/piwork/runtime"
+    fi
+}
+
+runtime_pack_is_ready() {
+    local dir="$1"
+
+    [[ -f "$dir/manifest.json" ]] \
+        && [[ -f "$dir/vmlinuz-virt" ]] \
+        && [[ -f "$dir/initramfs-virt-fast" ]]
+}
+
+ensure_runtime_pack() {
+    local dir
+    dir=$(runtime_dir)
+
+    if [[ "${PIWORK_RUNTIME_CACHE_HIT:-}" == "true" ]] && runtime_pack_is_ready "$dir"; then
+        echo "[runtime-build] cache hit and runtime pack is ready at $dir; skipping rebuild"
+        return
+    fi
+
+    if [[ "${PIWORK_RUNTIME_CACHE_HIT:-}" == "true" ]]; then
+        echo "[runtime-build] cache hit reported, but runtime pack is missing/incomplete at $dir; rebuilding"
+    else
+        echo "[runtime-build] cache miss; rebuilding runtime pack"
+    fi
+
+    mise run runtime-build
+}
+
 pnpm exec svelte-kit sync
-mise run runtime-build
+ensure_runtime_pack
 pnpm exec vitest run --minWorkers=1 --maxWorkers=1 \
     src/lib/__tests__/integration/runtime-steady-state.integration.test.ts \
     src/lib/__tests__/integration/journey-sequential.integration.test.ts