ci: work on CI

.github/actions/cache_restore/action.yml

@@ -4,13 +4,16 @@ runs:
   steps:
     - uses: actions/cache/restore@v4
       with:
-        # See https://doc.rust-lang.org/cargo/guide/cargo-home.html#caching-the-cargo-home-in-ci
         path: |
+          # See https://doc.rust-lang.org/cargo/guide/cargo-home.html#caching-the-cargo-home-in-ci
           ~/.cargo/.crates.toml
           ~/.cargo/.crates2.json
           ~/.cargo/bin/
           ~/.cargo/registry/index/
           ~/.cargo/registry/cache/
           ~/.cargo/git/db/
-        key: ${{ github.workflow }}
+          # See https://doc.rust-lang.org/cargo/guide/build-cache.html
+          target
+        key: branch|${{ runner.os }}|${{ github.job }}
+        restore-keys: main|${{ runner.os }}
 

.github/actions/cache_save/action.yml

@@ -4,13 +4,15 @@ runs:
   steps:
     - uses: actions/cache/save@v4
       with:
-        # See https://doc.rust-lang.org/cargo/guide/cargo-home.html#caching-the-cargo-home-in-ci
         path: |
+          # See https://doc.rust-lang.org/cargo/guide/cargo-home.html#caching-the-cargo-home-in-ci
           ~/.cargo/.crates.toml
           ~/.cargo/.crates2.json
           ~/.cargo/bin/
           ~/.cargo/registry/index/
           ~/.cargo/registry/cache/
           ~/.cargo/git/db/
-        key: ${{ github.workflow }}
+          # See https://doc.rust-lang.org/cargo/guide/build-cache.html
+          target
+        key: branch|${{ runner.os }}|${{ github.job }}|${{ github.run_attempt }}
 

.github/workflows/audit.yml

@@ -1,3 +1,4 @@
+name: audit
 on:
   push:
     branches: [ main ]

.github/workflows/cache.yml

@@ -0,0 +1,25 @@
+name: cache
+on:
+  schedule:
+    # 21:43 on Wednesday and Sunday. (Thanks, crontab.guru)
+    - cron: '43 21 * * 3,0'
+  workflow_dispatch:
+
+jobs:
+  create:
+    runs-on: ubuntu-latest
+
+    steps:
+      - run: cargo install just
+      - run: just install
+      - uses: actions/cache/save@v4
+        with:
+          path: |
+            # See https://doc.rust-lang.org/cargo/guide/cargo-home.html#caching-the-cargo-home-in-ci
+            ~/.cargo/.crates.toml
+            ~/.cargo/.crates2.json
+            ~/.cargo/bin/
+            ~/.cargo/registry/index/
+            ~/.cargo/registry/cache/
+            ~/.cargo/git/db/
+        key: main|${{ runner.os }}|${{ github.run_attempt }}

.github/workflows/main.yml

@@ -0,0 +1,81 @@
+name: main
+on:
+  push:
+    branches: [ main ]
+    paths:
+      - "**.rs"
+      - "**.toml"
+      - ".github/workflows/**"
+  pull_request:
+    branches: [ main ]
+    paths:
+      - "**.rs"
+      - "**.toml"
+      - ".github/workflows/**"
+  workflow_dispatch:
+
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
+
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: ./.github/actions/cache_restore
+      - run: cargo install just
+      - run: just check
+      - uses: ./.github/actions/cache_save
+
+  test:
+    strategy:
+      matrix:
+        os: [ ubuntu-latest, macos-latest, windows-latest ]
+    runs-on: ${{ matrix.os }}
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/cache_restore
+      - run: cargo install just
+      - run: just test
+      - uses: ./.github/actions/cache_save
+
+  coverage:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/cache_restore
+      - run: cargo install just
+      - run: just coverage
+      - uses: ./.github/actions/cache_save
+
+      - uses: coverallsapp/github-action@c203f016dd0ff7855ebef0ed852000c20c117148
+        with:
+          format: lcov
+          file: target/coverage/coverage.lcov
+
+  fuzz:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/cache_restore
+      - run: cargo install just
+      - run: just fuzz
+      - uses: ./.github/actions/cache_save
+
+  minimal_versions:
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: ./.github/actions/cache_restore
+      - run: cargo install just
+      - run: just minimal_versions
+      - uses: ./.github/actions/cache_save
+