feat: Maven Central release pipeline (KOJAK-35)

.github/release-drafter.yml

@@ -0,0 +1,4 @@
+template: |
+  ## What's Changed
+
+  $CHANGES

.github/workflows/ci.yml

@@ -4,6 +4,7 @@ on:
     branches: [ main ]
   push:
     branches: [ main ]
+    tags: [ v* ]
 
 permissions:
   contents: write       # auto-merge requirement
@@ -43,6 +44,14 @@ jobs:
           name: test-results-java-${{ matrix.java }}
           path: '**/build/test-results/test/TEST-*.xml'
 
+      - name: Prepare release notes
+        if: github.event_name == 'push' && !startsWith(github.ref, 'refs/tags/')
+        uses: release-drafter/release-drafter@v7
+        with:
+          config-name: release-drafter.yml
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   spring-compat:
     name: "Spring Boot ${{ matrix.spring-boot }}"
     runs-on: ubuntu-24.04
@@ -86,6 +95,48 @@ jobs:
       - name: Test okapi-kafka
         run: ./gradlew :okapi-kafka:test -PkafkaVersion=${{ matrix.kafka }}
 
+  publish:
+    name: Publish to Maven Central
+    needs: [build, spring-compat, kafka-compat]
+    runs-on: ubuntu-24.04
+    if: github.event_name != 'pull_request' && (startsWith(github.ref, 'refs/tags/v'))
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v6
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'temurin'
+          java-version: 21
+
+      - name: Setup Gradle
+        uses: gradle/actions/setup-gradle@39e147cb9de83bb9910b8ef8bd7fff0ee20fcd6f # v6.0.1
+
+      - name: Publish to Maven Central
+        run: ./gradlew publishAndReleaseToMavenCentral
+        env:
+          ORG_GRADLE_PROJECT_mavenCentralUsername: ${{ secrets.SONATYPE_USERNAME }}
+          ORG_GRADLE_PROJECT_mavenCentralPassword: ${{ secrets.SONATYPE_PASSWORD }}
+          ORG_GRADLE_PROJECT_signingInMemoryKey: ${{ secrets.PGP_SECRET }}
+          ORG_GRADLE_PROJECT_signingInMemoryKeyPassword: ${{ secrets.PGP_PASSPHRASE }}
+
+      - name: Extract version from tag
+        run: |
+          version=${GITHUB_REF/refs\/tags\/v/}
+          echo "VERSION=$version" >> $GITHUB_ENV
+
+      - name: Publish release notes
+        uses: release-drafter/release-drafter@v7
+        with:
+          config-name: release-drafter.yml
+          publish: true
+          name: "v${{ env.VERSION }}"
+          tag: "v${{ env.VERSION }}"
+          version: "v${{ env.VERSION }}"
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+
   auto-merge-dependabot:
     # only for PRs by dependabot[bot]
     if: github.event.pull_request.user.login == 'dependabot[bot]'

buildSrc/build.gradle.kts

@@ -9,4 +9,5 @@ kotlin {
 dependencies {
     implementation(libs.kotlinGradlePlugin)
     implementation(libs.ktlintGradlePlugin)
+    implementation(libs.vanniktechPublishPlugin)
 }

buildSrc/src/main/kotlin/publish.gradle.kts

@@ -0,0 +1,34 @@
+package buildsrc.convention
+
+plugins {
+    id("com.vanniktech.maven.publish")
+}
+
+mavenPublishing {
+    publishToMavenCentral()
+    signAllPublications()
+
+    pom {
+        name.set(project.name)
+        description.set(provider { project.description ?: "Transactional outbox pattern for Kotlin/JVM" })
+        url.set("https://github.com/softwaremill/okapi")
+        licenses {
+            license {
+                name.set("Apache-2.0")
+                url.set("https://www.apache.org/licenses/LICENSE-2.0")
+            }
+        }
+        developers {
+            developer {
+                id.set("softwaremill")
+                name.set("SoftwareMill")
+                url.set("https://softwaremill.com")
+            }
+        }
+        scm {
+            connection.set("scm:git:git://github.com/softwaremill/okapi.git")
+            developerConnection.set("scm:git:ssh://github.com/softwaremill/okapi.git")
+            url.set("https://github.com/softwaremill/okapi")
+        }
+    }
+}

gradle.properties

@@ -5,3 +5,6 @@ org.gradle.caching=true
 # (Note that some plugins may not yet be compatible with the configuration cache.)
 # https://docs.gradle.org/current/userguide/configuration_cache.html
 org.gradle.configuration-cache=true
+
+GROUP=com.softwaremill.okapi
+VERSION_NAME=0.1.0

gradle/libs.versions.toml

@@ -11,13 +11,15 @@ mysql = "9.6.0"
 kafkaClients = "4.2.0"
 spring = "7.0.6"
 springBoot = "4.0.5"
+vanniktechPublish = "0.36.0"
 wiremock = "3.13.2"
 slf4j = "2.0.17"
 assertj = "3.27.7"
 
 [libraries]
 kotlinGradlePlugin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }
 ktlintGradlePlugin = { module = "org.jlleitschuh.gradle:ktlint-gradle", version.ref = "ktlint" }
+vanniktechPublishPlugin = { module = "com.vanniktech:gradle-maven-publish-plugin", version.ref = "vanniktechPublish" }
 kotestRunnerJunit5 = { module = "io.kotest:kotest-runner-junit5", version.ref = "kotest" }
 kotestAssertionsCore = { module = "io.kotest:kotest-assertions-core", version.ref = "kotest" }
 exposedCore = { module = "org.jetbrains.exposed:exposed-core", version.ref = "exposed" }

okapi-bom/build.gradle.kts

@@ -1,7 +1,10 @@
 plugins {
     `java-platform`
+    id("buildsrc.convention.publish")
 }
 
+description = "BOM for consistent versioning of Okapi modules"
+
 dependencies {
     constraints {
         api(project(":okapi-core"))

okapi-core/build.gradle.kts

@@ -1,7 +1,10 @@
 plugins {
     id("buildsrc.convention.kotlin-jvm")
+    id("buildsrc.convention.publish")
 }
 
+description = "Core outbox abstractions and processing engine"
+
 dependencies {
     implementation(libs.slf4jApi)
     testImplementation(libs.kotestRunnerJunit5)

okapi-http/build.gradle.kts

@@ -1,7 +1,10 @@
 plugins {
     id("buildsrc.convention.kotlin-jvm")
+    id("buildsrc.convention.publish")
 }
 
+description = "HTTP message delivery for outbox entries"
+
 dependencies {
     implementation(project(":okapi-core"))
     implementation(libs.jacksonModuleKotlin)

okapi-kafka/build.gradle.kts

@@ -1,7 +1,10 @@
 plugins {
     id("buildsrc.convention.kotlin-jvm")
+    id("buildsrc.convention.publish")
 }
 
+description = "Apache Kafka message delivery"
+
 dependencies {
     implementation(project(":okapi-core"))
     implementation(libs.jacksonModuleKotlin)

okapi-mysql/build.gradle.kts

@@ -1,7 +1,10 @@
 plugins {
     id("buildsrc.convention.kotlin-jvm")
+    id("buildsrc.convention.publish")
 }
 
+description = "MySQL outbox store using Exposed"
+
 dependencies {
     implementation(project(":okapi-core"))
 

okapi-postgres/build.gradle.kts

@@ -1,7 +1,10 @@
 plugins {
     id("buildsrc.convention.kotlin-jvm")
+    id("buildsrc.convention.publish")
 }
 
+description = "PostgreSQL outbox store using Exposed"
+
 dependencies {
     implementation(project(":okapi-core"))
 

okapi-spring-boot/build.gradle.kts

@@ -1,7 +1,10 @@
 plugins {
     id("buildsrc.convention.kotlin-jvm")
+    id("buildsrc.convention.publish")
 }
 
+description = "Spring Boot autoconfiguration for Okapi"
+
 dependencies {
     implementation(project(":okapi-core"))