Initial: hello world + Gitea Actions cache workflow

.gitea/workflows/rust-cache-test.yml

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+name: Rust Build Cache Test
+
+on:
+  push:
+    branches:
+      - main
+      - master
+  pull_request:
+
+env:
+  CARGO_TERM_COLOR: always
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: https://gitea.com/actions/checkout@v4
+
+      - name: Get Cargo lock hash
+        id: hash
+        uses: https://gitea.com/actions/go-hashfiles@v0.0.1
+        with:
+          patterns: |
+            Cargo.lock
+            Cargo.toml
+
+      - name: Cache cargo
+        uses: https://gitea.com/actions/cache@v3
+        with:
+          path: |
+            ~/.cargo/registry
+            ~/.cargo/git
+            target
+          key: rust-${{ runner.os }}-${{ steps.hash.outputs.hash }}
+          restore-keys: |
+            rust-${{ runner.os }}-
+
+      - name: Show cache info
+        run: |
+          echo "=== Cache Key ==="
+          echo "rust-${{ runner.os }}-${{ steps.hash.outputs.hash }}"
+          echo ""
+          echo "=== Cargo cache directories ==="
+          du -sh ~/.cargo/registry ~/.cargo/git target 2>/dev/null || echo "Dirs not yet present"
+          echo ""
+          echo "=== Cargo version ==="
+          cargo --version
+
+      - name: Build
+        run: cargo build --verbose
+
+      - name: Run
+        run: cargo run
+
+      - name: Check cache after build
+        run: |
+          echo "=== After build ==="
+          echo "~/.cargo/registry: $(du -sh ~/.cargo/registry 2>/dev/null | cut -f1)"
+          echo "~/.cargo/git: $(du -sh ~/.cargo/git 2>/dev/null | cut -f1)"
+          echo "target: $(du -sh target 2>/dev/null | cut -f1)"

Cargo.toml

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+[package]
+name = "rust-hello-world"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]

README.md

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+# rust-hello-world
+
+Hello world Rust project for verifying Gitea Actions build cache.
+
+## What this tests
+
+1. `go-hashfiles` generates a hash from `Cargo.lock` and `Cargo.toml`
+2. `actions/cache@v3` caches `~/.cargo/registry`, `~/.cargo/git`, and `target`
+3. Subsequent runs should hit the cache and skip recompilation
+
+## Run locally
+
+```bash
+cargo build
+cargo run
+```

src/main.rs

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+fn main() {
+    println!("Hello, world!");
+}