Remove mxe GH action

.github/workflows/mxe.yml

@@ -1,89 +0,0 @@
-name: Windows cross build with MXE
-
-on:
-  push:
-    branches:
-      - master
-      - release-**
-    paths:
-    - 'src/**'
-    - 'external/**'
-    - 'python/**'
-    - 'tests/**'
-    - 'ms-windows/**'
-    - 'CMakeLists.txt'
-    - '.github/workflows/mxe.yml'
-  pull_request:
-    branches:
-      - master
-      - release-**
-    paths:
-    - 'src/**'
-    - 'external/**'
-    - 'python/**'
-    - 'tests/**'
-    - 'ms-windows/**'
-    - 'CMakeLists.txt'
-    - '.github/workflows/mxe.yml'
-
-jobs:
-  build:
-
-    env:
-      CCACHE_DIR: ${{ github.workspace }}/.ccache
-
-    runs-on: ubuntu-latest
-
-    steps:
-    - uses: actions/checkout@v2
-
-    - name: Build Dockerfile
-      run: |
-        cd ms-windows/mxe
-        docker build -f mxe.Dockerfile --tag mxe-qt5-builder:current .
-
-    - name: Prepare build cache for pull request
-      uses: pat-s/always-upload-cache@v2.1.3
-      if: github.event_name == 'pull_request'
-      with:
-        path: ${{ github.workspace }}/.ccache
-        key: mxe-ccache-${{ github.actor }}-${{ github.head_ref }}-${{ github.sha }}
-        # The head_ref or source branch of the pull request in a workflow run.
-        # The base_ref or target branch of the pull request in a workflow run.
-        restore-keys: |
-          mxe-ccache-${{ github.actor }}-${{ github.head_ref }}-
-          mxe-ccache-${{ github.base_ref }}-
-          mxe-ccache-refs/heads/master-
-
-    - name: Prepare build cache for branch/tag
-      # use a fork of actions/cache@v2 to upload cache even when the build or test failed
-      uses: pat-s/always-upload-cache@v2.1.3
-      if: github.event_name != 'pull_request'
-      with:
-        path: ${{ github.workspace }}/.ccache
-        # The branch or tag ref that triggered the workflow run. For branches this in the format refs/heads/<branch_name>, and for tags it is refs/tags/<tag_name>
-        key: mxe-ccache-${{ github.ref }}-${{ github.sha }}
-        restore-keys: |
-          mxe-ccache-${{ github.ref }}-
-          mxe-ccache-refs/heads/master-
-
-    - name: Cross build with MXE
-      run: |
-        mkdir -p ${{ github.workspace }}/.ccache
-        docker run -v ${GITHUB_WORKSPACE}:/root/QGIS \
-            -w /root/QGIS  \
-            --env CCACHE_DIR=/root/QGIS/.ccache \
-            mxe-qt5-builder:current \
-            /root/QGIS/ms-windows/mxe/build-mxe.sh
-
-    - name: Rename artifact
-      run: |
-        cd $GITHUB_WORKSPACE
-        mv qgis-mxe-release-*.zip qgis-mxe-release.zip
-
-    - name: Upload build
-      uses: actions/upload-artifact@v2.2.2
-      with:
-        name: QGIS for Windows 64bit
-        path: qgis-mxe-release.zip
-