chore: remove Windows support

- Removes coolify-testing-host.yml too, it published the testing host to Docker Hub for docker-compose.windows.yml alone, the development setup builds it locally

.github/workflows/coolify-testing-host.yml

@@ -1,80 +0,0 @@
-name: Coolify Testing Host
-
-on:
-  push:
-    branches: [ "next" ]
-    paths:
-      - .github/workflows/coolify-testing-host.yml
-      - docker/testing-host/Dockerfile
-
-permissions:
-  contents: read
-
-env:
-  DOCKER_REGISTRY: docker.io
-  IMAGE_NAME: "coollabsio/coolify-testing-host"
-
-jobs:
-  build-push:
-    strategy:
-      matrix:
-        include:
-          - arch: amd64
-            platform: linux/amd64
-            runner: ubuntu-24.04
-          - arch: aarch64
-            platform: linux/aarch64
-            runner: ubuntu-24.04-arm
-    runs-on: ${{ matrix.runner }}
-    steps:
-      - uses: actions/checkout@v5
-        with:
-          persist-credentials: false
-
-      - name: Login to ${{ env.DOCKER_REGISTRY }}
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.DOCKER_REGISTRY }}
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Build and Push Image (${{ matrix.arch }})
-        uses: docker/build-push-action@v6
-        with:
-          context: .
-          file: docker/testing-host/Dockerfile
-          platforms: ${{ matrix.platform }}
-          push: true
-          tags: |
-            ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:latest-${{ matrix.arch }}
-          labels: |
-            coolify.managed=true
-
-  merge-manifest:
-    runs-on: ubuntu-24.04
-    needs: build-push
-    steps:
-      - uses: actions/checkout@v5
-        with:
-          persist-credentials: false
-
-      - uses: docker/setup-buildx-action@v3
-
-      - name: Login to ${{ env.DOCKER_REGISTRY }}
-        uses: docker/login-action@v3
-        with:
-          registry: ${{ env.DOCKER_REGISTRY }}
-          username: ${{ secrets.DOCKERHUB_USERNAME }}
-          password: ${{ secrets.DOCKERHUB_TOKEN }}
-
-      - name: Create & publish manifest on ${{ env.DOCKER_REGISTRY }}
-        run: |
-          docker buildx imagetools create \
-          ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:latest-amd64 \
-          ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:latest-aarch64 \
-          --tag ${{ env.DOCKER_REGISTRY }}/${{ env.IMAGE_NAME }}:latest
-
-      - uses: sarisia/actions-status-discord@v1
-        if: always()
-        with:
-          webhook: ${{ secrets.DISCORD_WEBHOOK_DEV_RELEASE_CHANNEL  }}