Share one tool cache between CI and release builds, fall back to the last tools after a mise.toml change, and cache cargo-xwin for the Windows build

.gitea/workflows/ci.yaml

@@ -14,6 +14,8 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v4
+      # The same tool cache as in release.yaml: the same key and the same folders, or
+      # neither job can use what the other saved.
       - name: Restore tool cache
         uses: actions/cache@v4
         with:
@@ -24,7 +26,10 @@ jobs:
             ~/.rustup
             ~/.local/bin/mise
             ~/.local/share/mise
-          key: tools-check-${{ hashFiles('scripts/ci-setup.sh', 'mise.toml') }}
+          key: tools-${{ hashFiles('scripts/ci-setup.sh', 'mise.toml') }}
+          # After a change to mise.toml, start from the last tools; mise installs only what changed.
+          restore-keys: |
+            tools-
       - name: Restore build cache
         uses: actions/cache@v4
         with:

.gitea/workflows/release.yaml

@@ -24,10 +24,11 @@ jobs:
       CARGO_BUILD_JOBS: "2"
     steps:
       - uses: actions/checkout@v4
+      # The same tool cache as in ci.yaml: the same key and the same folders, or
+      # neither job can use what the other saved.
       - name: Restore tool cache
         uses: actions/cache@v4
         with:
-          # ~/.cache/cargo-xwin holds the Windows SDK files cargo-xwin downloads.
           path: |
             ~/.cargo/bin
             ~/.cargo/registry
@@ -35,8 +36,22 @@ jobs:
             ~/.rustup
             ~/.local/bin/mise
             ~/.local/share/mise
+          key: tools-${{ hashFiles('scripts/ci-setup.sh', 'mise.toml') }}
+          # After a change to mise.toml, start from the last tools; mise installs only what changed.
+          restore-keys: |
+            tools-
+      # cargo-xwin, which takes minutes to compile, and the Windows SDK files it downloads.
+      # The Windows Rust target is left out: rustup lists its installed parts in a file in
+      # the tool cache, and refuses to install the target over files that list does not name.
+      - name: Restore cargo-xwin cache
+        uses: actions/cache@v4
+        with:
+          path: |
+            ~/.cargo/bin/cargo-xwin
             ~/.cache/cargo-xwin
-          key: tools-release-${{ hashFiles('scripts/ci-setup.sh', 'mise.toml') }}
+          key: cargo-xwin-${{ hashFiles('scripts/ci-setup.sh', 'mise.toml') }}
+          restore-keys: |
+            cargo-xwin-
       - name: Restore build cache
         uses: actions/cache@v4
         with: