build(forgejo): add push-next job

.forgejo/workflows/demo.yaml

@@ -1,6 +0,0 @@
-on: [push]
-jobs:
-  test:
-    runs-on: docker
-    steps:
-      - run: echo All Good Now

.forgejo/workflows/push-next.yml

@@ -0,0 +1,33 @@
+name: Rust
+
+on:
+  push:
+    branches: ["next"]
+  pull_request:
+    branches: ["main"]
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: docker
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: actions-rs/toolchain@v1
+        with:
+          toolchain: stable
+      - uses: actions-rs/cargo@v1
+        with:
+          command: build
+          # args: --release --all-features
+      - uses: actions-rs/cargo@v1
+        with:
+          command: test
+
+      # - name: Build
+      #   run: cargo build --verbose
+      # - name: Run tests
+      #   run: cargo test --verbose