Publish ktlint cli signature to Github release.

Signed-off-by: Yahor Berdnikau <egorr.berd@gmail.com>

CHANGELOG.md

@@ -17,6 +17,7 @@ This project adheres to [Semantic Versioning](http://semver.org/).
 - Do not report when string-template expression is a keyword ([#883](https://github.com/pinterest/ktlint/issues/883))
 - False positive for subclass imports in `no-unused-imports` ([#845](https://github.com/pinterest/ktlint/issues/845))
 - False positive for static java function imports in `no-unused-imports` ([#872](https://github.com/pinterest/ktlint/issues/872))
+- Missing signature for KtLint CLI artifact published to Github release ([#895](https://github.com/pinterest/ktlint/issues/895))
 
 ### Changed
 - `Ktlint` object internal code cleanup

buildSrc/src/main/kotlin/ktlint-publication.gradle.kts

@@ -96,6 +96,10 @@ publishing {
  * ```
  */
 signing {
+    // Uncomment following line to use gpg-agent for signing
+    // See https://docs.gradle.org/current/userguide/signing_plugin.html#sec:using_gpg_agent how to configure it
+    //useGpgCmd()
+
     sign(publishing.publications["maven"])
     setRequired({
         !version.toString().endsWith("SNAPSHOT")

ktlint/build.gradle

@@ -5,6 +5,7 @@ plugins {
   id 'ktlint-publication'
   id 'com.github.johnrengelman.shadow'
   id 'org.gradle.crypto.checksum'
+  id 'signing'
 }
 
 jar {
@@ -47,15 +48,21 @@ def shadowJarExecutableTask = tasks.register("shadowJarExecutable", DefaultTask.
   group = "Distribution"
 
   inputs.files tasks.named("shadowJar")
-  outputs.file "$buildDir/run/ktlint"
+  outputs.files("$buildDir/run/ktlint")
+  if (!version.toString().endsWith("SNAPSHOT")) {
+    outputs.files("$buildDir/run/ktlint.asc")
+  }
 
   doLast {
-    File execFile = outputs.files.singleFile
+    File execFile = outputs.files.getFiles().first()
     execFile.withOutputStream {
       it.write "#!/bin/sh\n\nexec java -Xmx512m -jar \"\$0\" \"\$@\"\n\n".bytes
       it.write inputs.files.singleFile.bytes
     }
     execFile.setExecutable(true, false)
+    if (!version.toString().endsWith("SNAPSHOT")) {
+      signing.sign(execFile)
+    }
   }
   finalizedBy tasks.named("shadowJarExecutableChecksum")
 }
@@ -66,7 +73,7 @@ tasks.register("shadowJarExecutableChecksum", Checksum.class) {
 
   files = shadowJarExecutableTask.get().outputs.files
   // put the checksums in the same folder with the executable itself
-  outputDir = shadowJarExecutableTask.get().outputs.files.singleFile.parentFile
+  outputDir = shadowJarExecutableTask.get().outputs.files.getFiles().first().parentFile
 
   algorithm = Checksum.Algorithm.MD5
 }