.github/workflows/push.yml: enable ccache

This reduces the LINUX_X64_RELEASE_ZTS build time from 9-10 minutes to
less than 3 minutes.

Closes GH-10395

Author: MaxKellermann

.github/workflows/push.yml

@@ -17,6 +17,9 @@ on:
   pull_request:
     branches:
       - '**'
+env:
+  CC: ccache gcc
+  CXX: ccache g++
 jobs:
   LINUX_X64:
     strategy:
@@ -38,6 +41,13 @@ jobs:
         uses: ./.github/actions/setup-oracle
       - name: apt
         uses: ./.github/actions/apt-x64
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          # This duplicates the "job.name" expression above because
+          # GitHub has no way to query the job name (github.job is the
+          # job id, not the job name)
+          key: "LINUX_X64_${{ matrix.debug && 'DEBUG' || 'RELEASE' }}_${{ matrix.zts && 'ZTS' || 'NTS' }}-${{hashFiles('main/php_version.h')}}"
       - name: ./configure
         uses: ./.github/actions/configure-x64
         with:
@@ -83,6 +93,10 @@ jobs:
         uses: actions/checkout@v3
       - name: apt
         uses: ./.github/actions/apt-x32
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: "${{github.job}}-${{hashFiles('main/php_version.h')}}"
       - name: ./configure
         uses: ./.github/actions/configure-x32
         with:
@@ -109,6 +123,10 @@ jobs:
         uses: actions/checkout@v3
       - name: brew
         uses: ./.github/actions/brew
+      - name: ccache
+        uses: hendrikmuhs/ccache-action@v1.2
+        with:
+          key: "${{github.job}}-${{hashFiles('main/php_version.h')}}"
       - name: ./configure
         uses: ./.github/actions/configure-macos
         with:

.gitignore

@@ -281,6 +281,7 @@ tmp-php.ini
 # GitHub actions cache
 # ------------------------------------------------------------------------------
 /branch-commit-cache.json
+/.ccache/
 
 # ------------------------------------------------------------------------------
 # Special cases to invert previous ignore patterns