Delete temp file "detect_linux_distribution_" on exit (#155)

Ensure temporary Linux distribution detection script is deleted on exit

Author: TimoFrye

src/main/java/io/zonky/test/db/postgres/util/LinuxUtils.java

@@ -56,6 +56,7 @@ private static String resolveDistributionName() {
             try (InputStream source = LinuxUtils.class.getResourceAsStream("/sh/detect_linux_distribution.sh")) {
                 target = Files.createTempFile("detect_linux_distribution_", ".sh");
                 Files.copy(source, target, REPLACE_EXISTING);
+                target.toFile().deleteOnExit();
             }
 
             ProcessBuilder builder = new ProcessBuilder();