Add gitea build actions

.gitea/workflows/build.yaml

@@ -0,0 +1,37 @@
+name: build
+
+on: push
+env:
+    DEV_SHELL_NAME: CI
+    CI: true
+jobs:
+  build-cargo:
+    runs-on: flakes-action
+    steps:
+      - uses: actions/checkout@v3
+        name: Checkout
+      - name: 
+        run: |
+          nix develop -c cargo build --release
+  build-nix:
+    runs-on: flakes-action
+    steps:
+      - uses: actions/checkout@v3
+        name: Checkout
+      - name: 
+        run: |
+          nix build
+  check-nix:
+    runs-on: flakes-action
+    steps:
+      - uses: actions/checkout@v3
+        name: Checkout
+      - name: Metadata
+        run: |
+          nix flake metadata
+      - name: Statix
+        run: |
+          nix develop -c statix check
+      - name: Flake check
+        run: |
+          nix flake check