remove Buildx setup, native ARM64 Docker already available

.gitea/workflows/docker-build.yml

@@ -0,0 +1,49 @@
+name: Docker Build
+
+on:
+  push:
+    branches:
+      - master
+      - develop
+  pull_request:
+    branches:
+      - master
+      - develop
+
+jobs:
+  docker:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Login to Gitea Container Registry
+        if: github.event_name == 'push'
+        uses: docker/login-action@v3
+        with:
+          registry: gitea.forkless.com
+          username: ${{ secrets.GITEAUSER }}
+          password: ${{ secrets.GITEATOKEN }}
+
+      - name: Docker metadata
+        id: meta
+        uses: docker/metadata-action@v5
+        with:
+          images: gitea.forkless.com/forkless/mermaid-live-editor
+          tags: |
+            type=raw,value=latest,enable=${{ github.ref_name == 'master' }}
+            type=raw,value=nightly,enable=${{ github.ref_name == 'develop' }}
+            type=sha,prefix={{branch}}-
+
+      - name: Build and push
+        uses: docker/build-push-action@v5
+        with:
+          context: .
+          target: mermaid
+          push: ${{ github.event_name == 'push' }}
+          pull: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          build-args: |
+            MERMAID_RENDERER_URL=${{ vars.MERMAID_RENDERER_URL || 'https://mermaid.ink' }}
+            MERMAID_KROKI_RENDERER_URL=${{ vars.MERMAID_KROKI_RENDERER_URL || 'https://kroki.io' }}
+            MERMAID_IS_ENABLED_MERMAID_CHART_LINKS=false