feat(ci): add gitea release workflow for tag builds

.gitea/workflows/release.yml

@@ -0,0 +1,77 @@
+name: Release
+
+on:
+  push:
+    tags:
+      - "v*"
+
+jobs:
+  build-and-release:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Check out repository
+        uses: actions/checkout@v4
+
+      - name: Set up JDK 21
+        uses: actions/setup-java@v4
+        with:
+          distribution: temurin
+          java-version: "21"
+
+      - name: Build jar
+        run: ./gradlew build
+
+      - name: Find release artifact
+        id: artifact
+        shell: bash
+        run: |
+          set -euo pipefail
+          jar=$(find build/libs -maxdepth 1 -type f -name '*.jar' ! -name '*-sources.jar' ! -name '*-javadoc.jar' | head -n 1)
+          if [ -z "${jar}" ]; then
+            echo "No jar artifact found in build/libs" >&2
+            exit 1
+          fi
+          echo "path=${jar}" >> "$GITHUB_OUTPUT"
+          echo "name=$(basename "$jar")" >> "$GITHUB_OUTPUT"
+
+      - name: Create Gitea release
+        env:
+          GITEA_TOKEN: ${{ secrets.GITEA_TOKEN }}
+        shell: bash
+        run: |
+          set -euo pipefail
+
+          if [ -z "${GITEA_TOKEN:-}" ]; then
+            echo "Missing GITEA_TOKEN secret" >&2
+            exit 1
+          fi
+
+          api="${GITHUB_SERVER_URL}/api/v1"
+          repo="${GITHUB_REPOSITORY}"
+          tag="${GITHUB_REF_NAME}"
+          release_name="${tag}"
+          jar_path="${{ steps.artifact.outputs.path }}"
+          jar_name="${{ steps.artifact.outputs.name }}"
+
+          payload=$(jq -n \
+            --arg tag_name "$tag" \
+            --arg name "$release_name" \
+            --arg body "Automated release for $tag" \
+            '{tag_name:$tag_name,name:$name,body:$body,draft:false,prerelease:false}')
+
+          release=$(curl -fsSL \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            -H "Content-Type: application/json" \
+            -X POST \
+            -d "$payload" \
+            "${api}/repos/${repo}/releases")
+
+          release_id=$(printf '%s' "$release" | jq -r '.id')
+          upload_url="${api}/repos/${repo}/releases/${release_id}/assets?name=${jar_name}"
+
+          curl -fsSL \
+            -H "Authorization: token ${GITEA_TOKEN}" \
+            -H "Content-Type: application/octet-stream" \
+            --data-binary @"${jar_path}" \
+            "${upload_url}"