Fix CI issues (#3906)

Co-authored-by: barcode <barcode@example.com>

.github/external_ci/.drone.yml

@@ -1,22 +0,0 @@
-kind: pipeline
-name: test-on-arm64
-
-platform:
-  arch: arm64
-
-steps:
-- name: build
-  image: gcc
-  commands:
-  - wget https://github.com/Kitware/CMake/releases/download/v3.20.2/cmake-3.20.2.tar.gz
-  - tar xfz cmake-3.20.2.tar.gz
-  - cd cmake-3.20.2
-  - ./configure
-  - make cmake ctest -j10
-  - cd ..
-  - mkdir build
-  - cd build
-  - ../cmake-3.20.2/bin/cmake .. -DJSON_FastTests=ON
-  - make -j10
-  - cd tests
-  - ../../cmake-3.20.2/bin/ctest -j10

.github/workflows/ubuntu.yml

@@ -146,6 +146,9 @@ jobs:
       - uses: actions/checkout@v3
       - name: Get latest CMake and ninja
         uses: lukka/get-cmake@latest
+      - name: Set env FORCE_STDCPPFS_FLAG for clang 7 / 8 / 9 / 10
+        run: echo "JSON_FORCED_GLOBAL_COMPILE_OPTIONS=-DJSON_HAS_FILESYSTEM=0;-DJSON_HAS_EXPERIMENTAL_FILESYSTEM=0" >> "$GITHUB_ENV"
+        if: ${{ matrix.compiler == '7' || matrix.compiler == '8' || matrix.compiler == '9' || matrix.compiler == '10' }}
       - name: Run CMake
         run: cmake -S . -B build -DJSON_CI=On
       - name: Build