From 98b1cf38b26e264c0084e454a28eef482d174e5a Mon Sep 17 00:00:00 2001
From: Wolfgang Walther <walther@technowledgy.de>
Date: Tue, 6 Feb 2024 21:56:54 +0100
Subject: [PATCH] ci: Only save caches on main

This restores caches on all branches and pull requests, but only stores them on the main
branch. This prevents those caches from being evicted early when we hit the 10 GB limit
quickly.
---
 .github/workflows/build.yaml | 25 +++++++++++++++++++++----
 1 file changed, 21 insertions(+), 4 deletions(-)

diff --git a/.github/workflows/build.yaml b/.github/workflows/build.yaml
index ecf62c902b..47216c265f 100644
--- a/.github/workflows/build.yaml
+++ b/.github/workflows/build.yaml
@@ -114,8 +114,9 @@ jobs:
     runs-on: ${{ matrix.runs-on }}
     steps:
       - uses: actions/checkout@b4ffde65f46336ab88eb53be808477a3936bae11 # v4.1.1
-      - name: Stack working files cache
-        uses: actions/cache@ab5e6d0c87105b4c9c2047343972218f562e4319 # v4.0.1.0.1
+      - name: Restore stack working files cache
+        uses: actions/cache/restore@ab5e6d0c87105b4c9c2047343972218f562e4319 # v4.0.1
+        id: restore-cache
         with:
           path: ${{ matrix.cache }}
           key: stack-${{ runner.os }}-${{ hashFiles('stack.yaml.lock') }}
@@ -137,6 +138,12 @@ jobs:
             result/postgrest
             result/postgrest.exe
           if-no-files-found: error
+      - name: Save stack working files cache
+        if: ${{ github.ref == 'refs/heads/main' }}
+        uses: actions/cache/save@v4
+        with:
+          path: ${{ matrix.cache }}
+          key: ${{ steps.restore-cache.outputs.cache-primary-key }}
 
 
   freebsd:
@@ -170,8 +177,9 @@ jobs:
       - name: Fix caching
         run: |
           mkdir ~/.cabal
-      - name: Cache
-        uses: actions/cache@ab5e6d0c87105b4c9c2047343972218f562e4319 # v4.0.1.0.1
+      - name: Restore cache
+        uses: actions/cache/restore@ab5e6d0c87105b4c9c2047343972218f562e4319 # v4.0.1
+        id: restore-cache
         with:
           path: |
             ~/.cabal/packages
@@ -186,3 +194,12 @@ jobs:
           cabal build --only-dependencies --enable-tests --enable-benchmarks
       - name: Build
         run: cabal build --enable-tests --enable-benchmarks all
+      - name: Save cache
+        if: ${{ github.ref == 'refs/heads/main' }}
+        uses: actions/cache/save@v4
+        with:
+          path: |
+            ~/.cabal/packages
+            ~/.cabal/store
+            dist-newstyle
+          key: ${{ steps.restore-cache.outputs.cache-primary-key }}