Run the flake-regressions test suite on demand

.github/workflows/flake-regressions.yml

@@ -0,0 +1,29 @@
+name: "Flake regression test suite"
+
+on:
+  workflow_dispatch:
+  push:
+
+permissions: read-all
+
+jobs:
+
+  flake_regressions:
+    runs-on: ubuntu-22.04
+    steps:
+      - name: Checkout nix
+        uses: actions/checkout@v4
+      - name: Checkout flake-regressions
+        uses: actions/checkout@v4
+        with:
+          repository: DeterminateSystems/flake-regressions
+          path: flake-regressions
+      - name: Checkout flake-regressions-data
+        uses: actions/checkout@v4
+        with:
+          repository: DeterminateSystems/flake-regressions-data
+          path: flake-regressions/tests
+          ref: fix-escaping
+      - uses: DeterminateSystems/nix-installer-action@main
+      - uses: DeterminateSystems/magic-nix-cache-action@main
+      - run: scripts/flake-regressions.sh

scripts/flake-regressions.sh

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+#! /usr/bin/env bash
+
+set -e
+set -x
+
+#nix build --out-link ./new-nix
+
+export PATH=$(pwd)/new-nix:$PATH
+
+cd flake-regressions
+
+status=0
+
+flake=$(ls -d tests/*/*/* | head -n1)
+
+if ! REGENERATE=0 ./eval-flake.sh $flake; then
+    cat $flake/eval.stderr
+    status=1
+fi
+
+exit "$status"