Set up Actions cache for PHP_CodeSniffer and PHPStan

.github/workflows/php.yml

@@ -30,6 +30,18 @@ jobs:
           key: ${{ runner.os }}-composer-${{ hashFiles('**/composer.lock') }}
           restore-keys: ${{ runner.os }}-composer-
 
+      - name: Cache PHP_CodeSniffer intermediates
+        uses: actions/cache@v3
+        with:
+          path: ${{ runner.temp }}/phpcs
+          key: ${{ runner.os }}-phpcs
+
+      - name: Cache PHPStan intermediates
+        uses: actions/cache@v3
+        with:
+          path: ${{ runner.temp }}/phpstan
+          key: ${{ runner.os }}-phpstan
+
       - name: Install Composer dependencies
         run: >
           composer install \
@@ -39,10 +51,17 @@ jobs:
 
       - name: Run PHP_CodeSniffer
         if: always()
-        run: ./vendor/bin/phpcs -q --report=checkstyle | cs2pr --graceful-warnings
+        run: >
+          ./vendor/bin/phpcs \
+            -q \
+            --cache=${{ runner.temp }}/phpcs/cache.json \
+            --report=checkstyle \
+            | cs2pr --graceful-warnings
 
       - name: Run PHPStan
         if: always()
+        env:
+          PHPSTAN_TMP_DIR: ${{ runner.temp }}/phpstan
         run: ./vendor/bin/phpstan analyse --error-format=github --no-progress
 
   test:

phpstan.neon

@@ -1,5 +1,6 @@
 parameters:
-    tmpDir: phpstan/
+    includes:
+        - phpstan.neon.php
     level: 1
     paths:
         - bin/

phpstan.neon.php

@@ -0,0 +1,5 @@
+<?php declare(strict_types = 1);
+
+return [
+    'tmpDir' => getenv("PHPSTAN_TMP_DIR", true) ?: "",
+];