exec mode test flakes

[blampe]

What happened?

We are occasionally seeing these flakes:

    --- FAIL: TestBuild/exec-inline (1.61s)
    --- FAIL: TestBuild/exec-remoteContextWithInline (0.12s)
    --- FAIL: TestBuild/exec-remoteContext (0.20s)
    --- FAIL: TestBuild/exec-namedContext (0.13s)
    --- FAIL: TestBuild/exec-target (0.22s)

2024/03/28 18:23:20 http2: server connection error from localhost: connection error: PROTOCOL_ERROR

error reading server preface: EOF

We might have a concurrency issue with exec mode.

Also manifests as

=== CONT  TestBuild/exec-dockerLoad
error: dial unix /run/buildkit/buildkitd.sock: connect: no such file or directory
    client_test.go:309: 
        	Error Trace:	/home/runner/work/pulumi-docker-build/pulumi-docker-build/provider/internal/client_test.go:309
        	Error:      	Received unexpected error:
        	            	exit status 1
        	Test:       	TestBuild/exec-dockerLoad
        	Messages:   	error: dial unix /run/buildkit/buildkitd.sock: connect: no such file or directory
        	            	ERROR: listing workers for Build: failed to list workers: Unavailable: connection error: desc = "error reading server preface: EOF"

likely related to docker/buildx#1570.

My best guess is the daemon isn't yet ready to serve traffic, and we can probably smooth this over by retrying.

Example

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Output of pulumi about

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Additional context

No response

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