ci: major overhaul

- Simplify some workflow steps and auxiliary scripts
- Build library using cmake when not cross-compiling
- Try to fetch fixtures from cache first
- Use `actions-rust-lang/setup-rust-toolchain`

.github/workflows/response.yml

@@ -1,34 +1,47 @@
-name: no_response
+name: No response
+
 on:
   schedule:
-    - cron: '30 1 * * *' # Run every day at 01:30
+    - cron: "30 1 * * *" # Run every day at 01:30
   workflow_dispatch:
   issue_comment:
 
+permissions:
+  issues: write
+  pull-requests: write
+
 jobs:
   close:
+    name: Close issues with no response
     if: github.event_name == 'schedule' || github.event_name == 'workflow_dispatch'
     runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/github-script@v7
+      - name: Checkout script
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: .github/scripts/close_unresponsive.js
+          sparse-checkout-cone-mode: false
+
+      - name: Run script
+        uses: actions/github-script@v7
         with:
           script: |
             const script = require('./.github/scripts/close_unresponsive.js')
             await script({github, context})
 
   remove_label:
+    name: Remove response label
     if: github.event_name == 'issue_comment'
     runs-on: ubuntu-latest
-    permissions:
-      issues: write
-      pull-requests: write
     steps:
-      - uses: actions/checkout@v4
-      - uses: actions/github-script@v7
+      - name: Checkout script
+        uses: actions/checkout@v4
+        with:
+          sparse-checkout: .github/scripts/remove_response_label.js
+          sparse-checkout-cone-mode: false
+
+      - name: Run script
+        uses: actions/github-script@v7
         with:
           script: |
             const script = require('./.github/scripts/remove_response_label.js')