actions/editorconfig: disable until we can combine this with ofborg (#88608)

We cannot run this check now, as it marks CI as green even though ofborg has not
evaluated it yet. In future we might be able to mark ofborg as a required test:
https://github.com/NixOS/nixpkgs/pull/87853#issuecomment-632676824

.github/workflows/editorconfig.yml

@@ -1,22 +0,0 @@
-name: actions
-
-on:
-  pull_request:
-    branches:
-      - master
-
-jobs:
-  editorconfig:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: actions/checkout@v2
-    - uses: technote-space/get-diff-action@v1.2.8
-    - name: editorconfig check
-      env:
-        VERSION: "2.0.4"
-        OS: "linux"
-        ARCH: "amd64"
-      run: |
-        curl -sSf -O -L -C - https://github.com/editorconfig-checker/editorconfig-checker/releases/download/$VERSION/ec-$OS-$ARCH.tar.gz && \
-        tar xzf ec-$OS-$ARCH.tar.gz && \
-        ./bin/ec-$OS-$ARCH -disable-indentation ${{ env.GIT_DIFF }}