feat: configure CMake from the JavaScript Action (#72)

* feat(action): modify to run `main/index.mjs` on Node 20

* feat: add configure cmake step

* feat: output build directory

* feat: get `source-dir` and `build-dir` inputs

src/main.mts

@@ -0,0 +1,11 @@
+import core from "@actions/core";
+import exec from "@actions/exec";
+
+async function main() {
+  const sourceDir = core.getInput("source-dir");
+  const buildDir = core.getInput("build-dir");
+  await exec.exec("cmake", [sourceDir || ".", "-B", buildDir || "build"]);
+  core.setOutput("build-dir", buildDir || "build");
+}
+
+main();