Set workdir explicitly

Author: eddymoulton

.github/workflows/ci.yml

@@ -111,7 +111,7 @@ jobs:
               run: |
                   git_command="git config --global --add safe.directory /app"
                   test_command="dotnet test LibGit2Sharp.sln --configuration Release -p:TargetFrameworks=${{ matrix.tfm }} --logger "GitHubActions" -p:ExtraDefine=LEAKS_IDENTIFYING"
-                  docker run -t --rm --platform linux/${{ matrix.arch }} -v "$PWD:/app" -e OPENSSL_ENABLE_SHA1_SIGNATURES=1 gittools/build-images:${{ matrix.distro }}-sdk-${{ matrix.sdk }} sh -c "$git_command && $test_command"
+                  docker run -t --rm --platform linux/${{ matrix.arch }} -v "$PWD:/app" -w /app -e OPENSSL_ENABLE_SHA1_SIGNATURES=1 gittools/build-images:${{ matrix.distro }}-sdk-${{ matrix.sdk }} sh -c "$git_command && $test_command"
 
     nuget-push:
         name: Octopus NuGet Push