From 6d13ba4958381ea9cc325f034805a3fc63a403b6 Mon Sep 17 00:00:00 2001
From: Tim Nunamaker <tnunamak@gmail.com>
Date: Fri, 21 Aug 2026 16:23:20 -0500
Subject: [PATCH] ci: cache Rust deps and enable sccache for Tauri release
 builds

release.yml's 4-platform Tauri matrix rebuilt every Rust dependency
from scratch on every pull_request, with no actions/cache or
Swatinem/rust-cache step present. The macOS-intel and Windows legs
alone cost ~1200-1500s median per run.

Add Swatinem/rust-cache keyed on matrix.target to cache
~/.cargo and src-tauri/target, and layer sccache on top via
RUSTC_WRAPPER + SCCACHE_GHA_ENABLED so partial-invalidation builds
(e.g. a single crate bump) also get compiler-level cache reuse.

Signed-off-by: Tim Nunamaker <tnunamak@gmail.com>
---
 .github/workflows/release.yml | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/.github/workflows/release.yml b/.github/workflows/release.yml
index 2538515..8343e7f 100644
--- a/.github/workflows/release.yml
+++ b/.github/workflows/release.yml
@@ -23,6 +23,8 @@ jobs:
     env:
       APPLE_CERTIFICATE_AVAILABLE: ${{ github.event_name == 'release' && secrets.APPLE_BUILD_CERTIFICATE_BASE64 != '' }}
       APPLE_SIGNING_AVAILABLE: ${{ github.event_name == 'release' && secrets.APPLE_BUILD_CERTIFICATE_BASE64 != '' && secrets.APPLE_SIGNING_IDENTITY != '' }}
+      RUSTC_WRAPPER: sccache
+      SCCACHE_GHA_ENABLED: "true"
     strategy:
       fail-fast: false
       matrix:
@@ -97,6 +99,15 @@ jobs:
           toolchain: stable
           targets: ${{ matrix.target }}
 
+      - name: Cache Rust dependencies and build output
+        uses: Swatinem/rust-cache@6323deb102c322ba6fcbdcafc7e3dddab59af2b6 # v2.9.2
+        with:
+          workspaces: src-tauri -> target
+          key: ${{ matrix.target }}
+
+      - name: Setup sccache
+        uses: mozilla-actions/sccache-action@fc920bf0ec8de6ee65d409111f7ec508035751ba # v0.0.11
+
       - name: Stage Node.js runtime sidecar
         shell: bash
         run: node scripts/stage-pdpp-node.mjs --target "${{ matrix.target }}" --expected-platform "${{ matrix.node_platform }}" --expected-arch "${{ matrix.node_arch }}"