fix examples auth for github package;

fix jitpack build;
update readme with github package use instruction

.github/workflows/examples-CI.yml

@@ -10,6 +10,9 @@ jobs:
       run:
         working-directory: examples
     name: Java ${{ matrix.java }}
+    env:
+      USERNAME: ${{ GITHUB_ACTOR }}
+      TOKEN: ${{ secrets.GITHUB_TOKEN }}
     strategy:
       matrix:
         java: [11, 17]

README.md

@@ -124,11 +124,45 @@ Gradle | Version
 #### Snapshots
 
 <details>
-      <summary>Snapshots may be used through JitPack</summary>
+      <summary>Snapshots may be used through JitPack or GitHub packages</summary>
 
-* Go to [JitPack project page](https://jitpack.io/#ru.vyarus/gradle-animalsniffer-plugin)
-* Select `Commits` section and click `Get it` on commit you want to use
-  or use `master-SNAPSHOT` to use the most recent snapshot
+##### GitHub package
+
+WARNING: Accessing GitHub package requires [GitHub authorization](https://docs.github.com/en/enterprise-cloud@latest/packages/working-with-a-github-packages-registry/working-with-the-gradle-registry#authenticating-to-github-packages)!
+
+* Add to `settings.gradle` (top most!) (exact commit hash might be used as version) :
+
+  ```groovy
+  pluginManagement {
+      repositories {
+          gradlePluginPortal()      
+          maven { 
+              url = 'https://maven.pkg.github.com/xvik/gradle-animalsniffer-plugin'
+              credentials {
+                 username = settings.ext.find('gpr.user') ?: System.getenv("USERNAME")
+                 password = settings.ext.find('gpr.key') ?: System.getenv("TOKEN")
+            } 
+          }             
+      }
+  }    
+  ```   
+* In global gradle file `~/.gradle/gradle.properties` add
+  ```
+  gpr.user=<your github user name>
+  gpr.key=<your github password or classic token>
+  ```                                            
+  (or credentials must be declared in environment: USERNAME/TOKEN (more usable for CI))
+  Read [personal access tokens creation guide](https://docs.github.com/en/enterprise-cloud@latest/authentication/keeping-your-account-and-data-secure/managing-your-personal-access-tokens#creating-a-personal-access-token-classic)
+  Note that token needs only "package/read" permission 
+* Use plugin snapshot (see [the latest published package version](https://github.com/xvik/gradle-animalsniffer-plugin/packages/2339003)):
+
+  ```groovy
+  plugins {
+      id 'ru.vyarus.animalsniffer' version '2.0.0-SNAPSHOT'
+  }
+  ```  
+
+##### JitPack
 
 * Add to `settings.gradle` (top most!) (exact commit hash might be used as version) :
 
@@ -146,14 +180,16 @@ Gradle | Version
           maven { url 'https://jitpack.io' }              
       }
   }    
-  ``` 
+  ```  
+  Note: this would use the latest snapshot. To use exact commit version, go to
+  [JitPack project page](https://jitpack.io/#ru.vyarus/gradle-animalsniffer-plugin)
 * Use plugin without declaring version:
 
   ```groovy
   plugins {
       id 'ru.vyarus.animalsniffer'
   }
-  ```  
+  ```
 
 </details>
 

build.gradle

@@ -84,7 +84,7 @@ if (System.getenv("SNAPSHOT")) {
 }
 
 // skip signing for jitpack (snapshots)
-tasks.withType(Sign) { onlyIf { !System.getenv('JITPACK') || !System.getenv('SNAPSHOT') }}
+tasks.withType(Sign) { onlyIf { !(System.getenv('JITPACK') || System.getenv('SNAPSHOT')) }}
 
 // Required signing properties for release: signing.keyId, signing.password and signing.secretKeyRingFile
 // (https://docs.gradle.org/current/userguide/signing_plugin.html#sec:signatory_credentials)

examples/settings.gradle

@@ -3,7 +3,14 @@ pluginManagement {
         mavenLocal()
         gradlePluginPortal()
         google()
-        maven { url 'https://maven.pkg.github.com/xvik/gradle-animalsniffer-plugin' }
+        // for github package (used on CI)
+        maven {
+            url  = 'https://maven.pkg.github.com/xvik/gradle-animalsniffer-plugin'
+            credentials {
+                username = settings.ext.find('gpr.user') ?: System.getenv("USERNAME")
+                password = settings.ext.find('gpr.key') ?: System.getenv("TOKEN")
+            }
+        }
     }
 }