build(ci): automate release process

- Add release workflow
- Add snapshot release workflow

Author: dkasimovskiy

.github/workflows/README.md

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+# GitHub Actions Workflows
+
+This directory contains the GitHub Actions workflows for the project.
+
+## Workflows
+
+### 1. tests.yml
+- **Trigger**: Push to master branch or pull requests to master
+- **Purpose**: Run all tests (unit and integration) on multiple Tarantool versions
+- **Runs on**: Ubuntu latest
+
+### 2. release.yml
+- **Trigger**: Creation of tags matching semantic versioning pattern (e.g., `1.4.0`, `2.0.1`)
+- **Purpose**: Automatically release to Maven Central and create GitHub Release
+- **Runs on**: Ubuntu latest
+- **Requires secrets**:
+  - `OSSRH_USERNAME` - Sonatype OSSRH username
+  - `OSSRH_TOKEN` - Sonatype OSSRH password or token
+  - `MAVEN_GPG_PRIVATE_KEY` - GPG private key for signing artifacts
+  - `MAVEN_GPG_PASSPHRASE` - Passphrase for the GPG key
+  - `TARANTOOL_REGISTRY_PASSWORD` - Password for Tarantool private registry
+
+### 3. snapshot.yml
+- **Trigger**: Push to master branch (except commits starting with "Release")
+- **Purpose**: Automatically deploy snapshot versions to Maven Central
+- **Runs on**: Ubuntu latest
+- **Requires secrets**:
+  - `OSSRH_USERNAME` - Sonatype OSSRH username
+  - `OSSRH_TOKEN` - Sonatype OSSRH password or token
+  - `TARANTOOL_REGISTRY_PASSWORD` - Password for Tarantool private registry
+
+## Setup Instructions
+
+To enable automatic releases, you need to configure the following secrets in your GitHub repository settings:
+
+1. Go to Settings → Secrets and variables → Actions
+2. Add the following secrets:
+   - `OSSRH_USERNAME` - Your Sonatype OSSRH username
+   - `OSSRH_TOKEN` - Your Sonatype OSSRH token/password
+   - `MAVEN_GPG_PRIVATE_KEY` - Your GPG private key (export with `gpg --export-secret-keys --armor KEY_ID`)
+   - `MAVEN_GPG_PASSPHRASE` - Passphrase for your GPG key
+   - `TARANTOOL_REGISTRY_PASSWORD` - Password for the Tarantool private registry
+
+## Release Process
+
+### Automatic Release
+1. Create and push a new tag with semantic versioning format (e.g., `git tag 1.4.0 && git push origin 1.4.0`)
+2. The release workflow will automatically:
+   - Build and test the project
+   - Sign the artifacts with GPG
+   - Deploy to Maven Central
+   - Create a GitHub Release
+
+### Automatic Snapshot Deployment
+1. Push changes to the master branch
+2. The snapshot workflow will automatically:
+   - Build and test the project
+   - Deploy snapshot version to Maven Central
+
+Note: Commits with messages starting with "Release" are excluded from snapshot deployment to avoid duplicate deployments during the release process.

.github/workflows/release.yml

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+name: Release to Maven Central
+
+on:
+  push:
+    tags:
+      - '[0-9]+.[0-9]+.[0-9]+'
+
+jobs:
+  release:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up JDK 8
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'zulu'
+          java-version: '8'
+          server-id: ossrh
+          server-username: ${{ secrets.MAVEN_CENTRAL_USER }}
+          server-password: ${{ secrets.MAVEN_CENTRAL_TOKEN }}
+          gpg-private-key: ${{ secrets.MAVEN_CENTRAL_GPG_PRIVATE_KEY }}
+          gpg-passphrase: ${{ secrets.MAVEN_CENTRAL_GPG_PASSPHRASE }}
+
+      - name: Configure Git user
+        run: |
+          git config user.email "[email protected]"
+          git config user.name "GitHub Actions"
+
+      - name: Publish to Maven Central
+        run: |
+          ./mvnw -B clean deploy -P release -DskipTests

.github/workflows/snapshot.yml

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+name: Publish Snapshot to Maven Central
+
+on:
+  push:
+    branches:
+      - master
+
+jobs:
+  publish-snapshot:
+    runs-on: ubuntu-latest
+    if: "!startsWith(github.event.head_commit.message, 'Release')"
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v5
+
+      - name: Set up JDK 8
+        uses: actions/setup-java@v5
+        with:
+          distribution: 'zulu'
+          java-version: '8'
+          server-id: ossrh
+          server-username: ${{ secrets.MAVEN_CENTRAL_USER }}
+          server-password: ${{ secrets.MAVEN_CENTRAL_TOKEN }}
+
+      - name: Publish Snapshot to Maven Central
+        run: |
+          ./mvnw -B clean deploy -DskipTests