feat: add docker for tests

.gitea/workflows/docker.yaml

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+name: Build and push docker image
+run-name: Building docker image and push them to git.dacremont.xyz
+on:
+  workflow_dispatch: {}
+  push:
+    branches: [ "main" ]
+    paths:
+      - 'Dockerfile'
+    # Publish semver tags as releases.
+    tags: [ 'v*.*.*' ]
+
+
+env:
+  # Use docker.io for Docker Hub if empty
+  REGISTRY: git.dacremont.xyz
+  # gitea.repository as <account>/<repo>
+  IMAGE_NAME: ${{ gitea.repository }}
+
+
+jobs:
+  Build-and-push-docker:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      packages: write
+      # This is used to complete the identity challenge
+      # with sigstore/fulcio when running outside of PRs.
+      id-token: write
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+        # Set up BuildKit Docker container builder to be able to build
+        # multi-platform images and export cache
+        # https://`.com/docker/setup-buildx-action
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@f95db51fddba0c2d1ec667646a06c2ce06100226 # v3.0.0`
+
+      - name: Restore Docker cache
+        uses: actions/cache@v3
+        with:
+          path: /tmp/.buildx-cache
+          key: ${{ runner.os }}-buildx-${{ gitea.sha }}
+          restore-keys: |
+            ${{ runner.os }}-buildx-
+
+      # Login against a Docker registry except on PR
+      # https://`.com/docker/login-action
+      - name: Log into registry ${{ env.REGISTRY }}
+        uses: docker/login-action@343f7c4344506bcbf9b4de18042ae17996df046d # v3.0.0
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ secrets.username }}
+          password: ${{ secrets.TOKEN }}
+
+      - name: Build and push docker image
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          push: true
+          tags: |
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:${{ gitea.sha }}
+            ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}:latest
+          cache-from: type=local,src=/tmp/.buildx-cache
+          cache-to: type=local,dest=/tmp/.buildx-cache
+

Dockerfile

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+FROM alpine:latest
+
+WORKDIR /app
+
+RUN apk update && apk add docker
+
+ENTRYPOINT [ "/bin/sh" ]