Upgrade to proc macro

.github/workflows/tests.yaml

@@ -1,18 +1,39 @@
 name: Build
-on: [push]
+
+on:
+  push:
+    branches: [ main ]
+  pull_request:
+    branches: [ main ]
+  release:
+    types: [ published ]
+  workflow_dispatch:
+
 jobs:
-  main:
+  test:
     runs-on: ubuntu-latest
+    strategy:
+      fail-fast: false  # 7.6 is not yet supported properly. Once fixed, this can be set to true
+      matrix:
+        include:
+          - setup: varnish74
+          - setup: varnish75
+          - setup: varnish76
+    env:
+      RUST_BACKTRACE: 1
+      RUSTDOCFLAGS: -D warnings
+      RUSTFLAGS: -D warnings
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions-rs/toolchain@v1
-        with:
-          toolchain: stable
-      - run: |
-          sudo apt-get install -y curl
-          curl -s https://packagecloud.io/install/repositories/varnishcache/varnish75/script.deb.sh | sudo bash
-          sudo apt-get install varnish-dev
-      - run: |
-          cargo doc
-          cargo build
-          cargo test
+      - uses: taiki-e/install-action@v2
+        with: { tool: just }
+      - uses: actions/checkout@v4
+      - name: Ensure this crate has not yet been published (on release)
+        if: github.event_name == 'release'
+        run: just check-if-published
+      - uses: Swatinem/rust-cache@v2
+        if: github.event_name != 'release' && github.event_name != 'workflow_dispatch'
+      - name: install varnish-dev
+        run: |
+          curl -s https://packagecloud.io/install/repositories/varnishcache/${{ matrix.setup }}/script.deb.sh | sudo bash
+          sudo apt-get install -y varnish-dev
+      - run: just -v ci-test