CI: Add WASM script

In preparation for using the `run_task` script from maintainer tools we
want to have all the things that are particular to `rust-bitcoin` out of
the current `run_task` script.

The wasm test is specific to `hashes`. Add a script in `hashes/contrib`
and call it from the wasm job.

No test coverage change.

.github/workflows/rust.yml

@@ -246,8 +246,8 @@ jobs:
         uses: actions/checkout@v4
       - name: "Select toolchain"
         uses: dtolnay/rust-toolchain@stable
-      - name: "Run test script"
+      - name: "Run wasm script"
-        run: ./contrib/run_task.sh wasm
+        run: cd hashes && ./contrib/wasm.sh
 
   Schemars: # hashes crate only.
     name: Schemars - stable toolchain

contrib/run_task.sh

@@ -90,11 +90,6 @@ main() {
 	    do_bench
 	    ;;
 
-	wasm)
-            # hashes crate only.
-	    do_wasm
-	    ;;
-
 	asan)
             # hashes crate only - hashes/contrib/test_vars.sh is sourced in this function.
 	    do_asan
@@ -259,20 +254,6 @@ do_bench() {
     done
 }
 
-# Note we do not use the recent lock file or `--locked` when running the wasm tests.
-do_wasm() {
-    pushd "$REPO_DIR/hashes" > /dev/null
-
-    clang --version &&
-	CARGO_TARGET_DIR=wasm cargo install --force wasm-pack &&
-	printf '\n[target.wasm32-unknown-unknown.dev-dependencies]\nwasm-bindgen-test = "0.3"\n' >> Cargo.toml &&
-	printf '\n[lib]\ncrate-type = ["cdylib", "rlib"]\n' >> Cargo.toml &&
-	CC=clang-9 wasm-pack build &&
-	CC=clang-9 wasm-pack test --node;
-
-    popd > /dev/null
-}
-
 do_asan() {
     pushd "$REPO_DIR/hashes" > /dev/null
 

hashes/contrib/wasm.sh

@@ -0,0 +1,12 @@
+#!/usr/bin/env bash
+#
+# Run the WASM tests.
+
+set -euox pipefail
+
+clang --version &&
+    CARGO_TARGET_DIR=wasm cargo install --force wasm-pack &&
+    printf '\n[target.wasm32-unknown-unknown.dev-dependencies]\nwasm-bindgen-test = "0.3"\n' >> Cargo.toml &&
+    printf '\n[lib]\ncrate-type = ["cdylib", "rlib"]\n' >> Cargo.toml &&
+    CC=clang-9 wasm-pack build &&
+    CC=clang-9 wasm-pack test --node;