ci: Replace seed cachix workflow with new daemon mode

cachix-action v14 added a new daemon mode, which pushes new derivations to the store
as soon as they have been built. This replaces the seed cachix workflow nicely by just
pushing from all jobs directly.

.github/workflows/cachix.yaml

@@ -1,72 +0,0 @@
-name: Cachix
-
-# This workflow serves to
-#   - keep cachix up to date with the main branch
-#   - incrementally update cachix for large dependency
-#     updates, e.g. after running postgrest-nixpkgs-upgrade,
-#     which can cause the main CI workflow to time out
-
-on:
-  workflow_dispatch:
-  push:
-    branches:
-      - main
-      - rel-*
-    tags:
-      - v*
-
-jobs:
-  Seed-Cachix:
-    strategy:
-      fail-fast: false
-      matrix:
-        include:
-          - os: Linux
-            runs-on: ubuntu-latest
-          - os: MacOS
-            runs-on: macos-latest
-    name: Seed ${{ matrix.os }}
-    runs-on: ${{ matrix.runs-on }}
-    steps:
-      - uses: actions/checkout@v4
-      - name: Setup Nix Environment
-        uses: ./.github/actions/setup-nix
-        with:
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
-
-      - name: Install cachix tooling
-        run: |
-          nix-env -f default.nix -iA devTools.pushCachix.bin
-          postgrest-push-cachix
-
-      - name: Seed dynamic postgrest build
-        run: |
-          nix-build -A postgrestPackage
-          postgrest-push-cachix
-
-      - name: Seed style tools
-        run: |
-          nix-build -A style
-          postgrest-push-cachix
-
-      - name: Seed test tools
-        run: |
-          nix-build -A tests
-          postgrest-push-cachix
-
-      - name: Seed static toolchain
-        if: matrix.os == 'Linux'
-        run: |
-          nix-build -A packagesStatic.hello
-          postgrest-push-cachix
-
-      - name: Seed static postgrest build
-        if: matrix.os == 'Linux'
-        run: |
-          nix-build -A postgrestStatic
-          postgrest-push-cachix
-
-      - name: Build and push everything to Cachix
-        run: |
-          nix-build
-          postgrest-push-cachix

.github/workflows/ci.yaml

@@ -26,6 +26,7 @@ jobs:
       - 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
     
@@ -38,6 +39,7 @@ jobs:
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: style
           cache-id: common
       - name: Run linter (check locally with `nix-shell --run postgrest-lint`)
@@ -60,6 +62,7 @@ jobs:
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: tests
           cache-id: common
 
@@ -97,6 +100,7 @@ jobs:
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: tests withTools
           cache-id: common 
 
@@ -118,6 +122,7 @@ jobs:
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: memory
           cache-id: common
       - name: Run memory tests
@@ -131,6 +136,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
+        with:
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
       - name: Build static executable
         run: nix-build -A postgrestStatic
@@ -157,6 +164,8 @@ jobs:
       - uses: actions/checkout@v4
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
+        with:
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
       - name: Build everything
         run: |
@@ -469,6 +478,7 @@ jobs:
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
+          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: release
       - name: Download Docker image
         uses: actions/download-artifact@v4