feat(wasm-utxo): add build script to embed version info at compile time

Add a build script that extracts the version from package.json and
captures the git commit hash during build. These values are made available
as environment variables in the Rust code, providing better traceability
for deployments.

Also update GitHub workflows to use fetch-depth: 0 to ensure git history
is available for the build script.

Issue: BTC-2992

Co-authored-by: llm-git <llm-git@ttll.de>

Author: OttoAllmendinger

.github/workflows/build-and-test.yaml

@@ -27,6 +27,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          fetch-depth: 0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
@@ -122,6 +123,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          fetch-depth: 0
 
       - name: Install Rust
         uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9 # v1
@@ -186,6 +188,7 @@ jobs:
       - uses: actions/checkout@v4
         with:
           ref: ${{ github.event.pull_request.head.sha || github.sha }}
+          fetch-depth: 0
 
       - name: Setup Node
         uses: actions/setup-node@v4

packages/wasm-utxo/Cargo.toml

@@ -34,6 +34,9 @@ pastey = "0.1"
 [target.'cfg(not(target_arch = "wasm32"))'.dev-dependencies]
 zebra-chain = { version = "3.1", default-features = false }
 
+[build-dependencies]
+serde_json = "1.0"
+
 [profile.release]
 # this is required to make webpack happy
 # https://github.com/webpack/webpack/issues/15566#issuecomment-2558347645

packages/wasm-utxo/build.rs

@@ -0,0 +1,37 @@
+use std::process::Command;
+
+fn main() {
+    // Extract version from package.json using proper JSON parsing
+    let package_json =
+        std::fs::read_to_string("package.json").expect("Failed to read package.json");
+
+    let package: serde_json::Value =
+        serde_json::from_str(&package_json).expect("Failed to parse package.json as JSON");
+
+    let version = package
+        .get("version")
+        .and_then(|v| v.as_str())
+        .expect("Failed to find 'version' field in package.json");
+
+    println!("cargo:rustc-env=WASM_UTXO_VERSION={}", version);
+
+    // Capture git commit hash
+    let git_hash = Command::new("git")
+        .args(["rev-parse", "HEAD"])
+        .output()
+        .ok()
+        .and_then(|output| {
+            if output.status.success() {
+                String::from_utf8(output.stdout).ok()
+            } else {
+                None
+            }
+        })
+        .map(|s| s.trim().to_string())
+        .unwrap_or_else(|| "unknown".to_string());
+
+    println!("cargo:rustc-env=WASM_UTXO_GIT_HASH={}", git_hash);
+
+    // Rerun if package.json changes
+    println!("cargo:rerun-if-changed=package.json");
+}