Bump Stack CI to GHC 9.12

Author: andreasabel

.github/workflows/stack.yml

@@ -14,7 +14,7 @@ jobs:
       fail-fast: false
       matrix:
         os:      [ubuntu-latest,macos-latest,windows-latest]
-        ghc-ver: ['9.10', '9.8', '9.6']
+        ghc-ver: ['9.12', '9.10', '9.8', '9.6']
           # Snapshots for 9.4.8, 9.2.8, 9.0.2, 8.10.7 do not have a recent enough base-compat; 0.13 is needed.
           # On ubuntu-22.04 the old versions 8.8.4, 8.6.5, 8.4.4, 8.2.2 fail due to HsOpenSSL linking errors.
           # They used to work under ubuntu-20.04, but it is not worth the trouble maintaining them.
@@ -34,7 +34,7 @@ jobs:
         shell: bash
 
     steps:
-    - uses: actions/checkout@v4
+    - uses: actions/checkout@v5
 
     - uses: haskell-actions/setup@v2
       id: setup

hackage-cli.cabal

@@ -39,6 +39,7 @@ extra-source-files:
   fixtures/*.diff
   fixtures/*.cabal
   -- Supported GHC versions when building with stack:
+  stack-9.12.yaml
   stack-9.10.yaml
   stack-9.8.yaml
   stack-9.6.yaml

stack-9.10.yaml

@@ -1,4 +1,4 @@
-resolver: nightly-2025-05-28
+resolver: lts-24.7
 compiler: ghc-9.10.2
 compiler-check: match-exact
 

stack-9.12.yaml

@@ -0,0 +1,7 @@
+resolver: nightly-2025-08-30
+compiler: ghc-9.12.2
+compiler-check: match-exact
+
+flags:
+  HsOpenSSL:
+    use-pkg-config: true

stack-9.8.yaml

@@ -1,4 +1,4 @@
-resolver: lts-23.24
+resolver: lts-23.28
 
 flags:
   HsOpenSSL: