Adde gitea workflow: tests

.gitea/workflows/Dockerfile_tests

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+FROM golang:latest
+
+RUN apt install -y make curl python3 && go install gotest.tools/gotestsum@latest
+
+COPY . /source
+
+WORKDIR /source
+
+CMD ["make", "test"]

.gitea/workflows/tests.yml

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+
+# https://docs.gitea.com/next/usage/actions/quickstart
+# https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions
+# https://docs.github.com/en/actions/learn-github-actions/contexts#github-context
+
+name: Build Docker and Deploy
+run-name: Build & Deploy ${{ gitea.ref }} on ${{ gitea.actor }}
+
+on: [push]
+
+jobs:
+  run_tests:
+    name: Run goext test-suite
+    runs-on: bfb-cicd-latest
+    steps:
+
+      - name: Check out code
+        uses: actions/checkout@v3
+
+      - name: Build test docker
+        id: build_docker
+        run: echo "DOCKER_IMG_ID=$(docker build -q . -f .gitea/workflows/Dockerfile_tests || echo __err_build__)" >> $GITHUB_OUTPUT
+
+      - name: Run tests
+        run: docker run --rm "${{ steps.build_docker.outputs.DOCKER_IMG_ID }}"
+
+      - name: Cleanup
+        if: always()
+        run: docker image rm "${{ steps.build_docker.outputs.DOCKER_IMG_ID }}"
+