ci: Remove nix actions cache and prepopulate job

The nix actions cache currently leads to repeated "no space left on
devices" errors for jobs in CI.

The prepopulate job is useless without the nix actions cache, so it
will go away at the same time.

.github/actions/setup-nix/action.yaml

@@ -7,9 +7,6 @@ inputs:
     description: Token to pass to cachix
   tools:
     description: Tools to install with nix-env -iA <tools>
-  cache-id:
-    description: Cache id to use for cache-nix-action
-    default: "default"
 
 runs:
   using: composite
@@ -17,12 +14,6 @@ runs:
     - uses: nixbuild/nix-quick-install-action@v26
       with:
         nix_version: '2.13.6'
-    - name: Restore and cache Nix store
-      uses: nix-community/cache-nix-action@v4.0.3
-      with:
-        key: cache-nix-${{ runner.os }}-${{ inputs.cache }}-${{ hashFiles('**/*.nix', 'nix/**/*.patch') }}
-        restore-keys: |
-          cache-nix-${{ runner.os }}-${{ inputs.cache }}-
     - uses: cachix/cachix-action@v14
       with:
         name: postgrest

.github/workflows/ci.yaml

@@ -18,22 +18,9 @@ concurrency:
   cancel-in-progress: "${{ !(github.ref == 'refs/heads/main' || startsWith(github.ref, 'refs/tags/v') || startsWith(github.ref, 'refs/heads/rel-')) }}"
 
 jobs:
-  Prepopulate-Nix-Cache-Linux:
-    name: Prepopulate Nix cache for Linux runners
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v4
-      - name: Setup Nix Environment
-        uses: ./.github/actions/setup-nix
-        with:
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-          cache-id: common
-          tools: style withTools memory tests release postgrestPackage
-    
   Lint-Style:
     name: Lint & check code style
     runs-on: ubuntu-latest
-    needs: [Prepopulate-Nix-Cache-Linux]
     steps:
       - uses: actions/checkout@v4
       - name: Setup Nix Environment
@@ -41,7 +28,6 @@ jobs:
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: style
-          cache-id: common
       - name: Run linter (check locally with `nix-shell --run postgrest-lint`)
         run: postgrest-lint
       - name: Run style check (auto-format with `nix-shell --run postgrest-style`)
@@ -51,7 +37,6 @@ jobs:
   Test-Nix:
     name: Test (Nix)
     runs-on: ubuntu-latest
-    needs: [Prepopulate-Nix-Cache-Linux]
     defaults:
       run:
         # Hack for enabling color output, see:
@@ -64,7 +49,6 @@ jobs:
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: tests
-          cache-id: common
 
       - name: Run coverage (IO tests and Spec tests against PostgreSQL 15)
         run: postgrest-coverage
@@ -89,7 +73,6 @@ jobs:
         pgVersion: [9.6, 10, 11, 12, 13, 14, 15, 16]
     name: Test PG ${{ matrix.pgVersion }} (Nix)
     runs-on: ubuntu-latest
-    needs: [Prepopulate-Nix-Cache-Linux]
     defaults:
       run:
         # Hack for enabling color output, see:
@@ -102,7 +85,6 @@ jobs:
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: tests withTools
-          cache-id: common 
 
       - name: Run spec tests
         if: always()
@@ -116,7 +98,6 @@ jobs:
   Test-Memory-Nix:
     name: Test memory (Nix)
     runs-on: ubuntu-latest
-    needs: [Prepopulate-Nix-Cache-Linux]
     steps:
       - uses: actions/checkout@v4
       - name: Setup Nix Environment
@@ -124,7 +105,6 @@ jobs:
         with:
           authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: memory
-          cache-id: common
       - name: Run memory tests
         run: postgrest-test-memory
 

.github/workflows/loadtest.yaml

@@ -26,7 +26,6 @@ jobs:
         uses: ./.github/actions/setup-nix
         with:
           tools: loadtest
-          cache-id: test-loadtest
       - uses: actions-ecosystem/action-get-latest-tag@v1
         id: get-latest-tag
         with:
@@ -58,7 +57,6 @@ jobs:
         uses: ./.github/actions/setup-nix
         with:
           tools: loadtest
-          cache-id: test-loadtest
       - name: Run loadtest
         run: |
           postgrest-loadtest-against ${{ steps.get-latest-tag.outputs.tag }}