Complete 26.3 parity acceptance and dual-version release workflow

.gitea/workflows/build.yml

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+name: Build and smoke
+
+on: [push, pull_request]
+
+permissions:
+  contents: read
+
+jobs:
+  changes:
+    runs-on: ubuntu-latest
+    outputs:
+      matrix: ${{ steps.targets.outputs.matrix }}
+      any: ${{ steps.targets.outputs.any }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Check release workflow safeguards
+        run: python3 scripts/test_release_workflow.py -v
+      - id: targets
+        env:
+          BASE: ${{ github.event.pull_request.base.sha || github.event.before }}
+        run: |
+          base="$BASE"
+          if [ -z "$base" ] || ! git cat-file -e "$base^{commit}" 2>/dev/null; then
+            base=$(git rev-parse HEAD^)
+          fi
+          matrix=$(python3 scripts/changed_targets.py --base "$base")
+          echo "matrix=$matrix" >> "$GITHUB_OUTPUT"
+          if [ "$matrix" = '{"include":[]}' ]; then
+            echo "any=false" >> "$GITHUB_OUTPUT"
+          else
+            echo "any=true" >> "$GITHUB_OUTPUT"
+          fi
+  build:
+    needs: changes
+    if: needs.changes.outputs.any == 'true'
+    runs-on: ubuntu-latest
+    timeout-minutes: 20
+    strategy:
+      fail-fast: false
+      max-parallel: 1
+      matrix: ${{ fromJSON(needs.changes.outputs.matrix) }}
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+          fetch-tags: true
+      - uses: actions/setup-java@v4
+        with:
+          java-version: ${{ matrix.java }}
+          distribution: temurin
+      - uses: gradle/actions/setup-gradle@v4
+      - name: Build Minecraft target
+        run: ./gradlew ${{ matrix.gradle_args }} --console=plain
+      - name: Disposable dedicated-server smoke
+        run: python3 scripts/smoke_server.py --target ${{ matrix.target }}
+      - name: Keep smoke logs
+        if: always()
+        uses: actions/upload-artifact@v3
+        with:
+          name: smoke-${{ matrix.target }}
+          path: build/verification/${{ matrix.target }}/*.log
+          if-no-files-found: ignore