Add integration testing utilities

.dockerignore

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+*
+!wastebasket.test*
+

test.ps1

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+# remove preexisting test binaries from other systems to keep build context small
+Remove-Item wastebasket.test*
+
+# read the first arg or default to "windows"
+$os = $args[0] ?? "windows"
+$env:GOOS=$os; go test -c .
+$env:DOCKER_CONTEXT="desktop-$os"; docker build -t temp_test -f ".\test_$os.Dockerfile" .
+docker image rm temp_test
+

test_linux.Dockerfile

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+# nanoserver doesn't have a shell, so we can't run the test, as we require
+# shell systemcalls such as SHFileOperationW.
+FROM docker.io/debian:trixie-slim 
+
+WORKDIR /test
+copy wastebasket.test ./test
+RUN ./test
+

test_windows.Dockerfile

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+# nanoserver doesn't have a shell, so we can't run the test, as we require
+# shell systemcalls such as SHFileOperationW.
+FROM mcr.microsoft.com/windows/servercore:ltsc2022-amd64
+
+WORKDIR /test
+copy wastebasket.test.exe ./test.exe
+RUN test.exe
+