chore: Remove cabal.project.non-nix

We don't have any source-repository-package stanzas in there anymore, so there's no
need to keep it around anymore.

.github/scripts/arm/build.sh

@@ -55,7 +55,6 @@ cd ~/$SCRIPT_DIR
 git clone https://github.com/PostgREST/postgrest.git
 cd postgrest
 git checkout $PGRST_GITHUB_COMMIT
-cp cabal.project.non-nix cabal.project
 cabal v2-update && cabal v2-build
 
 # Strip unused symbols from executable

.github/workflows/build.yaml

@@ -164,10 +164,9 @@ jobs:
           ghcup config add-release-channel https://raw.githubusercontent.com/haskell/ghcup-metadata/master/ghcup-vanilla-0.0.8.yaml
           ghcup install ghc ${{ matrix.ghc }}
           ghcup set ghc ${{ matrix.ghc }}
-      - name: Copy cabal.project & fix caching
+      - name: Fix caching
         run: |
           mkdir ~/.cabal
-          cp cabal.project.non-nix cabal.project
       - name: Cache
         uses: actions/cache@13aacd865c20de90d75de3b17ebe84f7a17d57d2 # v4
         with:

cabal.project

@@ -1,2 +1,4 @@
 packages: postgrest.cabal
 tests: true
+package *
+  ghc-options: -split-sections

cabal.project.non-nix

@@ -1,18 +0,0 @@
--- Settings to allow building with plain cabal. If this was
--- named just cabal.project, it would interfere with the default
--- nix build.
-
-packages: .
-
-package *
-  ghc-options: -split-sections
-
--- Example of depending on a forked repository (the same dependency
--- would be mentioned in nix/overlays/haskell-packages.nix and
--- stack.yaml, and should refer to a main branch commit of the
--- repository.
---
--- source-repository-package
---  type: git
---  location: https://github.com/PostgREST/hasql-pool.git
---  tag: 4d462c4d47d762effefc7de6c85eaed55f144f1d