CI cache

.github/workflows/ci.yml

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+name: "CI"
+on:
+  push:
+    paths-ignore:
+      - "README.rst"
+    branches:
+      - "main"
+  pull_request:
+    branches:
+      - "*"
+
+jobs:
+  ci:
+    runs-on: "ubuntu-latest"
+    continue-on-error: "${{ matrix.experimental }}"
+    strategy:
+      fail-fast: false
+      matrix:
+        emacs-version:
+          - "26.1"
+          - "26.2"
+          - "26.3"
+          - "27.1"
+          - "27.2"
+          - "28.1"
+          - "28.2"
+          - "29.1"
+        experimental: [false]
+        include:
+          - emacs-version: "snapshot"
+            experimental: true
+
+    steps:
+      - uses: "actions/checkout@v4"
+
+      - name: "Build cache inputs"
+        id: "cache-inputs"
+        run: |
+          {
+            echo 'cache-path<<EOF'
+            echo ~/.cask
+            echo ~/.emacs.d
+            echo EOF
+          } >> "$GITHUB_OUTPUT"
+          echo 'cache-key=cask-${{ hashFiles('Cask') }}' >> "$GITHUB_OUTPUT"
+
+      - uses: "actions/cache@v3"
+        id: "emacs-cask-cache"
+        with:
+          path: "${{ steps.cache-inputs.outputs.cache-path }}"
+          key: "${{ steps.cache-inputs.outputs.cache-key }}"
+
+      - uses: "purcell/setup-emacs@master"
+        with:
+          version: "${{ matrix.emacs-version }}"
+
+      - if: ${{ steps.emacs-cask-cache.outputs.cache-hit != 'true' }}
+        uses: "cask/setup-cask@master"
+        with:
+          version: "0.9.0"
+
+      - name: "Compile"
+        run: |
+          make compile
+
+      - uses: "actions/setup-go@v4"
+        with:
+          go-version: "stable"
+          check-latest: true
+          cache: false
+
+      - name: "Install tomljson"
+        run: |
+          go install github.com/pelletier/go-toml/v2/cmd/tomljson@latest
+
+      - name: "Test"
+        run: |
+          make test