chore: add new workflows (changelog, automatic releases)

Docker images will now be built on every release

.gitea/workflows/01_docker.yaml

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+# Credits: https://www.vanmeeuwen.dev/blog/automating-docker-builds-with-gitea-actions
+# https://gitea.com/gitea/runner-images/src/branch/main/.gitea/workflows/release.yaml
+
+name: Build and push Docker image
+run-name: Build ${{  github.ref_name }} image
+
+on:
+  push:
+    tags:
+      - "*"
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v3
+
+      - name: Set up Docker BuildX
+        uses: docker/setup-buildx-action@v3
+
+      - name: Login to registry
+        uses: docker/login-action@v2
+        with:
+          registry: gitea.7o7.cx
+          username: ${{ secrets.REGISTRY_USER }}
+          password: ${{ secrets.REGISTRY_PASSWORD }}
+
+      - name: Set outputs
+        id: vars
+        env:
+          BRANCH_NAME: ${{ github.ref_name }}
+        run: |
+          #echo branch_name="$BRANCH_NAME" | tee -a $GITHUB_OUTPUT
+          #echo short_hash=$(git rev-parse --short HEAD) | tee -a $GITHUB_OUTPUT
+          echo current_tag=$GITHUB_REF_NAME | tee -a $GITHUB_OUTPUT
+
+      - name: Build and push
+        uses: docker/build-push-action@v6
+        with:
+          context: .
+          platforms: |
+            linux/amd64
+            linux/arm64
+          pull: true
+          push: true
+          # Change when working on a different branch!
+          tags: |
+            gitea.7o7.cx/kittyteam/kittybe:master-${{ steps.vars.outputs.current_tag }}
+            gitea.7o7.cx/kittyteam/kittybe:latest
+
+      - name: Log out from registry
+        if: always()
+        run: docker logout gitea.7o7.cx