feat(ci): add ability to publish to github maven repository

Signed-off-by: Sphericalkat <amolele@gmail.com>

.github/workflows/publish.yml

@@ -0,0 +1,25 @@
+name: Publish snapshots
+
+on:
+  push:
+    branches:
+      - main
+
+jobs:
+  publish:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@8e5e7e5ab8b370d6c329ec480221332ada57f0ab # v3.5.2
+
+      - name: Set up JDK
+        uses: actions/setup-java@5ffc13f4174014e2d4d4572b3d74c3fa61aeb2c2 # v3.11.0
+        with:
+          distribution: 'temurin'
+          java-version: '17'
+
+      - name: Publish snapshots
+        uses: gradle/gradle-build-action@749f47bda3e44aa060e82d7b3ef7e40d953bd629 # v2.4.2
+        with:
+          arguments: publishAllPublicationsToGithubPackagesRepository
+

atomic/build.gradle.kts

@@ -1,10 +1,26 @@
+import java.net.URI
+
 plugins {
     id("java")
     id("java-library")
+    id ("maven-publish")
 }
 
 group = "jp.co.goalist"
 
+publishing {
+    repositories {
+        maven {
+            name = "GithubPackages"
+            url = uri("https://maven.pkg.github.com/SphericalKat/atomic-demo")
+            credentials {
+                username = System.getenv("GITHUB_ACTOR")
+                password = System.getenv("GITHUB_TOKEN")
+            }
+        }
+    }
+}
+
 repositories {
     mavenCentral()
 }