ci: remove GitHub CI — native git.hanzo.ai + cd.hanzo.ai only

This workflow ran on a self-hosted actions-runner-controller pool. ARC is
decommissioned: CI executes inside git.hanzo.ai (Gitea Actions, .hanzo/workflows)
and delivery is cd.hanzo.ai reconciling the reviewed image pin in
hanzoai/universe. GitHub is a mirror and runs nothing.

Removed rather than repointed — there is no GitHub-side pool to move to, and
leaving it would keep ARC load-bearing.

.github/workflows/server-tests-postgres.yml

@@ -1,117 +0,0 @@
-name: Server (Postgres)
-
-on:
-  pull_request:
-    paths-ignore:
-      - '**.js'
-      - '**.md'
-      - '**.html'
-    types: [opened, labelled, synchronize, reopened]
-
-concurrency:
-  group: server-postgres-develop-${{ github.event_name }}-${{ github.event.number || github.event_name == 'workflow_dispatch' && github.run_id || '' }}
-  cancel-in-progress: true
-
-jobs:
-  test:
-    if: ${{ contains(github.event.pull_request.labels.*.name, 'postgres') }}
-    runs-on: hanzo-build-linux-amd64
-    timeout-minutes: 60
-
-    strategy:
-      fail-fast: false
-      matrix:
-       container: [1]
-
-    name: Python Unit Tests
-
-    services:
-      postgres:
-        image: postgres:13.3
-        env:
-          POSTGRES_PASSWORD: travis
-        options: >-
-          --health-cmd pg_isready
-          --health-interval 10s
-          --health-timeout 5s
-          --health-retries 5
-        ports:
-          - 5432:5432
-
-    steps:
-
-      - name: Clone
-        uses: actions/checkout@v4
-
-      - name: Setup Python
-        uses: actions/setup-python@v5
-        with:
-          python-version: '3.12'
-
-      - name: Check for valid Python & Merge Conflicts
-        run: |
-          python -m compileall -f "${GITHUB_WORKSPACE}"
-          if grep -lr --exclude-dir=node_modules "^<<<<<<< " "${GITHUB_WORKSPACE}"
-              then echo "Found merge conflicts"
-              exit 1
-          fi
-
-      - name: Setup Node
-        uses: actions/setup-node@v4
-        with:
-          node-version: 18
-          check-latest: true
-
-      - name: Add to Hosts
-        run: echo "127.0.0.1 test_site" | sudo tee -a /etc/hosts
-
-      - name: Cache pip
-        uses: actions/cache@v4
-        with:
-          path: ~/.cache/pip
-          key: ${{ runner.os }}-pip-${{ hashFiles('**/*requirements.txt', '**/pyproject.toml') }}
-          restore-keys: |
-            ${{ runner.os }}-pip-
-            ${{ runner.os }}-
-
-      - name: Cache node modules
-        uses: actions/cache@v4
-        env:
-          cache-name: cache-node-modules
-        with:
-          path: ~/.npm
-          key: ${{ runner.os }}-build-${{ env.cache-name }}-${{ hashFiles('**/package-lock.json') }}
-          restore-keys: |
-            ${{ runner.os }}-build-${{ env.cache-name }}-
-            ${{ runner.os }}-build-
-            ${{ runner.os }}-
-
-      - name: Install pnpm
-        uses: pnpm/action-setup@v4
-        with:
-          version: 9.15.0
-
-      - name: Get pnpm store directory
-        id: pnpm-cache
-        shell: bash
-        run: echo "STORE_PATH=$(pnpm store path --silent)" >> $GITHUB_OUTPUT
-
-      - uses: actions/cache@v4
-        with:
-          path: ${{ steps.pnpm-cache.outputs.STORE_PATH }}
-          key: ${{ runner.os }}-pnpm-${{ hashFiles('*/pnpm-lock.yaml') }}
-          restore-keys: |
-            ${{ runner.os }}-pnpm-
-
-      - name: Install
-        run: bash ${GITHUB_WORKSPACE}/.github/helper/install.sh
-        env:
-          DB: postgres
-          TYPE: server
-
-      - name: Run Tests
-        run: cd ~/frappe-bench/ && bench --site test_site run-parallel-tests --app erpnext --use-orchestrator
-        env:
-          TYPE: server
-          CI_BUILD_ID: ${{ github.run_id }}
-          ORCHESTRATOR_URL: http://test-orchestrator.frappe.io