Do not build on each push

.forgejo/workflows/build.yaml

@@ -1,34 +0,0 @@
-on:
-  pull_request:
-    types: [opened, synchronize, reopened]
-  push:
-    branches:
-      - master
-env:
-  IMAGE_TAG: git.myservermanager.com/msm/forgejo-base-executor-image
-jobs:
-  build:
-    runs-on: docker
-    container:
-      image: node:20-bookworm
-    steps:
-      - name: Prepare requirements
-        run: |
-          apt-get update
-          apt-get install -y curl wget bash apt-transport-https ca-certificates gnupg
-          curl -fsSL https://download.docker.com/linux/debian/gpg | gpg --dearmor -o /usr/share/keyrings/docker.gpg
-          echo "deb [arch=$(dpkg --print-architecture) signed-by=/usr/share/keyrings/docker.gpg] https://download.docker.com/linux/debian bookworm stable" | tee /etc/apt/sources.list.d/docker.list > /dev/null
-          apt-get update
-          apt-get -y install docker-ce docker-ce-cli containerd.io docker-buildx-plugin
-      - name: Checkout
-        uses: actions/checkout@v3
-
-      - name: Set up Docker Buildx
-        uses: docker/setup-buildx-action@v2
-
-      - name: Test docker image build
-        uses: docker/build-push-action@v4
-        with:
-          push: false
-          tags: |
-            ${{ env.IMAGE_TAG }}:${{ github.sha }}