Make generated bash scripts valid on Ubuntu.

Author: olafurpg

cli/src/main/scala/com/sourcegraph/lsif_java/Embedded.scala

@@ -29,7 +29,7 @@ object Embedded {
       """"$@""""
     ).mkString(" ")
     val script =
-      s"""#!/bin/sh
+      s"""#!/usr/bin/env bash
          |set -eu
          |LAUNCHER_ARGS=()
          |echo $$@ >> $launcherArgs

cli/src/main/scala/com/sourcegraph/lsif_java/buildtools/GradleJavaCompiler.scala

@@ -68,7 +68,7 @@ case class GradleJavaCompiler(languageVersion: String, javacPath: Path) {
     Files
       .write(
         dir.resolve("bin").resolve("java"),
-        s"""#!/bin/sh
+        s"""#!/usr/bin/env bash
            |set -eu
            |echo $$@ >> ${dir.resolve("java_arguments")}
            |${javaCommand.mkString(" ")}