chore(internal): add back release workflow

Author: meorphis

.github/workflows/create-releases.yml

@@ -0,0 +1,50 @@
+name: Create releases
+on:
+  schedule:
+    - cron: '0 5 * * *' # every day at 5am UTC
+  push:
+    branches:
+      - main
+
+jobs:
+  release:
+    name: release
+    if: github.ref == 'refs/heads/main' && github.repository == 'openai/openai-java'
+    runs-on: ubuntu-latest
+    environment: publish
+
+    steps:
+      - uses: actions/checkout@v4
+
+      - uses: stainless-api/trigger-release-please@v1
+        id: release
+        with:
+          repo: ${{ github.event.repository.full_name }}
+          stainless-api-key: ${{ secrets.STAINLESS_API_KEY }}
+
+      - name: Set up Java
+        if: ${{ steps.release.outputs.releases_created }}
+        uses: actions/setup-java@v3
+        with:
+          distribution: temurin
+          java-version: |
+            8
+            17
+          cache: gradle
+
+      - name: Set up Gradle
+        if: ${{ steps.release.outputs.releases_created }}
+        uses: gradle/gradle-build-action@v2
+
+      - name: Publish to Sonatype
+        if: ${{ steps.release.outputs.releases_created }}
+        run: |-
+          export -- GPG_SIGNING_KEY_ID
+          printenv -- GPG_SIGNING_KEY | gpg --batch --passphrase-fd 3 --import 3<<< "$GPG_SIGNING_PASSWORD"
+          GPG_SIGNING_KEY_ID="$(gpg --with-colons --list-keys | awk -F : -- '/^pub:/ { getline; print "0x" substr($10, length($10) - 7) }')"
+          ./gradlew publishAndReleaseToMavenCentral --stacktrace -PmavenCentralUsername="$SONATYPE_USERNAME" -PmavenCentralPassword="$SONATYPE_PASSWORD"
+        env:
+          SONATYPE_USERNAME: ${{ secrets.OPENAI_SONATYPE_USERNAME || secrets.SONATYPE_USERNAME }}
+          SONATYPE_PASSWORD: ${{ secrets.OPENAI_SONATYPE_PASSWORD || secrets.SONATYPE_PASSWORD }}
+          GPG_SIGNING_KEY: ${{ secrets.OPENAI_SONATYPE_GPG_SIGNING_KEY || secrets.GPG_SIGNING_KEY }}
+          GPG_SIGNING_PASSWORD: ${{ secrets.OPENAI_SONATYPE_GPG_SIGNING_PASSWORD || secrets.GPG_SIGNING_PASSWORD }}