update-dependencies fails when attempting to update existing PR

[mthalman]

The update-dependencies tool has special logic that handles a case where there's an existing PR. This logic fails with the following error:

System.TypeInitializationException: The type initializer for 'LibGit2Sharp.Core.NativeMethods' threw an exception.
 ---> System.DllNotFoundException: Unable to load shared library 'git2-106a5f2' or one of its dependencies. In order to help diagnose loading problems, consider setting the LD_DEBUG environment variable: libgit2-106a5f2: cannot open shared object file: No such file or directory
   at LibGit2Sharp.Core.NativeMethods.git_libgit2_init()
   at LibGit2Sharp.Core.NativeMethods.InitializeNativeLibrary()
   at LibGit2Sharp.Core.NativeMethods..cctor()
   --- End of inner exception stack trace ---
   at LibGit2Sharp.Core.NativeMethods.git_clone(git_repository*& repo, String origin_url, FilePath workdir_path, GitCloneOptions& opts)
   at LibGit2Sharp.Core.Proxy.git_clone(String url, String workdir, GitCloneOptions& opts)
   at LibGit2Sharp.Repository.Clone(String sourceUrl, String workdirPath, CloneOptions options)
   at Dotnet.Docker.Program.UpdateExistingPullRequest(GitHubAuth gitHubAuth, PullRequestOptions prOptions, String commitMessage, GitHubBranch upstreamBranch) in /update-dependencies/Program.cs:line 188
   at Dotnet.Docker.Program.CreatePullRequestAsync() in /update-dependencies/Program.cs:line 155
   at Dotnet.Docker.Program.Main(String[] args) in /update-dependencies/Program.cs:line 53

[omajid]

We have seen this problem when the version of libgit2.so isn't compatible with the platform, for some reason or another. For example, if the x64 version is being loaded when the platform is arm64. What os/container is this code running in?

[omajid]

Some repos, like sourcelink, even migrated off of libgit2sharp because of portability issues: dotnet/sourcelink#288

[mthalman]

Nothing too fancy going on. The build job literally builds the Dockerfile locally and runs it. This runs on an AMD64 machine.

[MichaelSimons]

@mthalman can this issue be closed? If not what work is remaining?