actions: init lukegbcom deployer workflow

.forgejo/workflows/lukegbcom.yaml

@@ -0,0 +1,17 @@
+on: [push]
+jobs:
+  build:
+    runs-on: cacher
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Drop in ops/secrets/default.nix
+        run: |
+          echo "$OPS_SECRETS_DEFAULTNIX" > ops/secrets/default.nix
+        env:
+          OPS_SECRETS_DEFAULTNIX: "${{ secrets.OPS_SECRETS_DEFAULTNIX }}"
+
+      - name: Build and deploy
+        run: |
+          web/lukegbcom/deploy.sh