install lua and ruby on CI runner for integration tests

Runtimes are installed via apt-get so all plugin tests run properly.

Author: zdk

.github/workflows/release.yml

@@ -65,6 +65,11 @@ jobs:
 
       - uses: dtolnay/rust-toolchain@stable
 
+      - name: Install test runtimes
+        run: |
+          sudo apt-get update
+          sudo apt-get install -y lua5.4 ruby
+
       - name: Verify tag matches workspace version
         run: |
           TAG="${GITHUB_REF#refs/tags/v}"

crates/lowfat-runner/src/process.rs

@@ -115,16 +115,6 @@ mod tests {
     use lowfat_core::level::Level;
     use std::io::Write;
 
-    fn has_runtime(bin: &str) -> bool {
-        std::process::Command::new("which")
-            .arg(bin)
-            .stdout(std::process::Stdio::null())
-            .stderr(std::process::Stdio::null())
-            .status()
-            .map(|s| s.success())
-            .unwrap_or(false)
-    }
-
     fn make_input(raw: &str) -> FilterInput {
         FilterInput {
             raw: raw.to_string(),
@@ -207,7 +197,6 @@ json.dump({"output": "\n".join(lines)}, sys.stdout)
 
     #[test]
     fn ruby_raw_filter() {
-        if !has_runtime("ruby") { return; }
         let code = r#"
 $stdin.each_line do |line|
   puts line unless line.start_with?("warning:")
@@ -221,7 +210,6 @@ end
 
     #[test]
     fn lua_raw_filter() {
-        if !has_runtime("lua") { return; }
         let code = r#"
 for line in io.lines() do
   if not line:match("^warning:") then