ci: Split cabal and stack work caches from regular cache

This is a first step to split up the cabal and stack caches in separate
pieces. Here we split the work folder, which just contains the
postgrest-specific build artifacts, into a separate cache.

More fine-grained caching should give us better cache hits and much
fewer upload size in the regular case, improving CI performance.

.cirrus.yml

@@ -19,8 +19,20 @@ build_task:
 
   stack_cache:
     folders: /.stack
-    fingerprint_script: cat postgrest.cabal stack.yaml.lock
-    reupload_on_changes: false
+    fingerprint_script:
+      - echo $CIRRUS_OS
+      - stack --version
+      - md5sum postgrest.cabal
+      - md5sum stack.yaml.lock
+
+  stack_work_cache:
+    folders: .stack-work
+    fingerprint_script:
+      - echo $CIRRUS_OS
+      - stack --version
+      - md5sum postgrest.cabal
+      - md5sum stack.yaml.lock
+      - find main src -type f -iname '*.hs' -exec md5sum "{}" +
 
   build_script: |
     stack build -j 1 --local-bin-path . --copy-bins

.github/workflows/build.yaml

@@ -91,35 +91,38 @@ jobs:
             runs-on: ubuntu-22.04
             cache: |
               ~/.stack
-              .stack-work
             # no artifact for Linux, because we use the static build
 
           - name: MacOS
             runs-on: macos-12
             cache: |
               ~/.stack
-              .stack-work
             artifact: postgrest-macos-x64
 
           - name: Windows
             runs-on: windows-2022
             cache: |
               ~\AppData\Roaming\stack
               ~\AppData\Local\Programs\stack
-              .stack-work
             deps: Add-Content $env:GITHUB_PATH $env:PGBIN
             artifact: postgrest-windows-x64
 
     name: Stack - ${{ matrix.name }}
     runs-on: ${{ matrix.runs-on }}
     steps:
       - uses: actions/checkout@44c2b7a8a4ea60a981eaca3cf939b5f4305c123b # v4.1.5
-      - name: Stack working files cache
+      - name: Cache ~/.stack
         uses: ./.github/actions/cache-on-main
         with:
           path: ${{ matrix.cache }}
           prefix: stack
-          suffix: ${{ hashFiles('stack.yaml.lock') }}
+          suffix: ${{ hashFiles('postgrest.cabal', 'stack.yaml.lock') }}
+      - name: Cache .stack-work
+        uses: ./.github/actions/cache-on-main
+        with:
+          path: .stack-work
+          prefix: stack-work-${{ hashFiles('postgrest.cabal', 'stack.yaml.lock') }}
+          suffix: ${{ hashFiles('main/**/*.hs', 'src/**/*.hs') }}
       - name: Install dependencies
         if: matrix.deps
         run: ${{ matrix.deps }}
@@ -169,15 +172,20 @@ jobs:
       - name: Fix caching
         run: |
           mkdir ~/.cabal
-      - name: Cache
+      - name: Cache .cabal
         uses: ./.github/actions/cache-on-main
         with:
           path: |
             ~/.cabal/packages
             ~/.cabal/store
-            dist-newstyle
           prefix: cabal-${{ matrix.ghc }}
           suffix: ${{ hashFiles('postgrest.cabal', 'cabal.project', 'cabal.project.freeze') }}
+      - name: Cache dist-newstyle
+        uses: ./.github/actions/cache-on-main
+        with:
+          path: dist-newstyle
+          prefix: cabal-${{ matrix.ghc }}-dist-newstyle-${{ hashFiles('postgrest.cabal', 'cabal.project', 'cabal.project.freeze') }}
+          suffix: ${{ hashFiles('**/*.hs') }}
       - name: Install dependencies
         run: |
           cabal update