ci: Add workflow to seed cachix (PostgREST#2615)

Fixes PostgREST#2609.

.github/workflows/cachix.yaml

@@ -0,0 +1,77 @@
+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:
+      matrix:
+        include:
+          - os: Linux
+            runs-on: ubuntu-latest
+          - os: MacOS
+            runs-on: macos-latest
+    name: Seed ${{ matrix.os }}
+    runs-on: ${{ matrix.runs-on }}
+    steps:
+      - uses: actions/checkout@v3
+      - name: Setup Nix Environment
+        uses: ./.github/actions/setup-nix
+        with:
+          authToken: '${{ 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.haskellPackages.hello
+          postgrest-push-cachix
+
+      - name: Seed static postgresql build (for libpq)
+        if: matrix.os == 'Linux'
+        run: |
+          nix-build -A packagesStatic.pkgs.postgresql
+          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

@@ -108,7 +108,6 @@ jobs:
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
         with:
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
           tools: tests
 
       - name: Build static executable
@@ -131,13 +130,6 @@ jobs:
           path: postgrest-docker.tar.gz
           if-no-files-found: error
 
-      - name: Build and push everything to Cachix (main branch only)
-        if: ${{ github.ref == 'refs/heads/main' }}
-        run: |
-          nix-build
-          nix-env -f default.nix -iA devTools
-          postgrest-push-cachix
-
 
   Build-Macos-Nix:
     name: Build MacOS (Nix)
@@ -146,18 +138,10 @@ jobs:
       - uses: actions/checkout@v3
       - name: Setup Nix Environment
         uses: ./.github/actions/setup-nix
-        with:
-          authToken: '${{ secrets.CACHIX_AUTH_TOKEN }}'
 
       - name: Build everything
         run: |
           nix-build
-          nix-env -f default.nix -iA devTools
-
-      - name: Push to Cachix (main branch only)
-        if: ${{ github.ref == 'refs/heads/main' }}
-        run: |
-          postgrest-push-cachix
 
 
   Build-Stack:

default.nix

@@ -65,11 +65,17 @@ let
   postgrest =
     pkgs.haskell.packages."${compiler}".callCabal2nix name src { };
 
-  # Function that derives a fully static Haskell package based on
+  # Functionality that derives a fully static Haskell package based on
   # nh2/static-haskell-nix
   staticHaskellPackage =
     import nix/static-haskell-package.nix { inherit nixpkgs system compiler patches allOverlays; };
 
+  # Static executable.
+  postgrestStatic =
+    lib.justStaticExecutables (lib.dontCheck (staticHaskellPackage name src).package);
+
+  packagesStatic = (staticHaskellPackage name src).survey;
+
   # Options passed to cabal in dev tools and tests
   devCabalOptions =
     "-f dev --test-show-detail=direct";
@@ -152,8 +158,8 @@ rec {
     pkgs.callPackage nix/tools/withTools.nix { inherit devCabalOptions postgresqlVersions postgrest; };
 } // pkgs.lib.optionalAttrs pkgs.stdenv.isLinux rec {
   # Static executable.
-  postgrestStatic =
-    lib.justStaticExecutables (lib.dontCheck (staticHaskellPackage name src));
+  inherit postgrestStatic;
+  inherit packagesStatic;
 
   # Docker images and loading script.
   docker =

nix/static-haskell-package.nix

@@ -59,4 +59,7 @@ let
   survey =
     import "${patched-static-haskell-nix}/survey" { inherit normalPkgs compiler defaultCabalPackageVersionComingWithGhc; };
 in
-survey.haskellPackages."${name}"
+{
+  inherit survey;
+  package = survey.haskellPackages."${name}";
+}

nix/tools/devTools.nix

@@ -304,4 +304,5 @@ buildToolbox
     hsieGraphModules
     hsieGraphSymbols
   ];
+  extra = { inherit pushCachix; };
 }