Add workflow Materialize

Author: ttuegel

.github/workflows/materialize.yml

@@ -0,0 +1,37 @@
+name: 'Materialize'
+on:
+  push:
+    branches-ignore:
+      - 'master'
+jobs:
+  release:
+    name: 'Materialize'
+    runs-on: ubuntu-latest
+    steps:
+      - name: Check out code
+        uses: actions/[email protected]
+        with:
+          submodules: recursive
+
+      - name: Install Nix
+        uses: cachix/install-nix-action@v12
+        with:
+          extra_nix_config: |
+            substituters = http://cache.nixos.org https://hydra.iohk.io
+            trusted-public-keys = cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY= hydra.iohk.io:f/Ea+s+dFdN+3Y/G+FDgSq+a5NEWhJGzdjvKNGv0/EQ=
+
+      - name: Install Cachix
+        uses: cachix/cachix-action@v8
+        with:
+          name: runtimeverification
+          extraPullNames: 'kore'
+          skipPush: true
+
+      - name: Materialize
+        run: ./nix/rematerialize.sh
+
+      - name: Commit changes
+        uses: stefanzweifel/[email protected]
+        with:
+          commit_message: 'Materialize Nix expressions'
+          file_pattern: 'nix/'