add CI Test support

.github/workflows/CITest.yml

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+name: Run Test
+on: [push, pull_request]
+env:
+  CI: true
+jobs:
+  tests:
+    runs-on: ubuntu-20.04
+    name: build_test on ubuntu 20.04
+
+    steps:
+    - uses: actions/checkout@v2
+
+    - name: make
+      shell: 'script -q -e -c "bash {0}"'
+      run: |
+        ./make.sh
+        make check
+        sudo make install
+        cp libcapstone.so.* bindings/python/libcapstone.so
+        cd tests
+        ./test_all.sh

tests/test_all.sh

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+./test_arm
+./test_arm64
+./test_basic
+./test_bpf
+./test_customized_mnem
+./test_detail
+./test_evm
+./test_iter
+./test_m680x
+./test_m68k
+./test_mips
+./test_mos65xx
+./test_ppc
+./test_skipdata
+./test_sparc
+./test_systemz
+./test_tms320c64x
+./test_wasm
+./test_winkernel
+./test_x86
+./test_xcore