Replace AppVeyor with Github Actions (#10439)

.github/workflows/windows-unittests.yml

@@ -0,0 +1,54 @@
+name: "Windows unit tests"
+
+on: [push]
+
+jobs:
+  test:
+    runs-on: windows-2019 # https://github.com/actions/virtual-environments/blob/main/images/win/Windows2019-Readme.md
+    steps:
+      - name: Set git to use LF # needed so gofmt doesn't think every file needs reformatting
+        run: |
+          git config --global core.autocrlf false
+          git config --global core.eol lf
+
+      - name: Checkout datadog-agent repository
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 0 #needed for 'git describe' to work
+
+      - name: Install python
+        uses: actions/setup-python@v2
+        with:
+          python-version: '3.8.10'
+
+      - name: Install go
+        uses: actions/setup-go@v2
+        with:
+          go-version: '1.16.7'
+
+      - name: Set up runner
+        run: |
+          $ErrorActionPreference = 'Stop';
+          # install dependencies
+          python -m pip install codecov -r requirements.txt
+          If ($lastExitCode -ne "0") { throw "Previous command returned $lastExitCode" }
+          inv -e install-tools
+          If ($lastExitCode -ne "0") { throw "Previous command returned $lastExitCode" }
+          inv -e deps
+          If ($lastExitCode -ne "0") { throw "Previous command returned $lastExitCode" }
+          # create 'ddagentuser' user to test the secrets feature on windows
+          $Password = ConvertTo-SecureString "dummyPW_:-gch6Rejae9" -AsPlainText -Force
+          New-LocalUser -Name "ddagentuser" -Description "Test user for the secrets feature on windows." -Password $Password
+
+      - name: Run tests
+        shell: bash # using bash so we don't have to check $lastExitCode all the time
+        run: |
+          export PATH="/c/msys64/mingw64/bin:/c/msys64/usr/bin/:$PATH" # prepend msys, otherwise make from mingw gets used
+          echo $PATH
+          inv -e rtloader.make
+          inv -e rtloader.format --raise-if-changed
+          inv -e rtloader.install
+          # FIXME: skipping rtloader tests because they fail
+          # inv -e rtloader.test
+          inv -e test --rerun-fails=2 --python-runtimes 3 --coverage --profile --fail-on-fmt --python-home-3=$pythonLocation
+          codecov -f profile.cov -F windows