Add .git-blame-ignore-revs and seed with clang-format commit

We can include in this file commits which do mechanical changes like linting that are rarely of value when tracing through history. You can then tell `git blame` to ignore those commits using: ``` git config blame.ignoreRevsFile .git-blame-ignore-revs ``` The GitHub blame UI automatically does this. Closes: #3963
coreos · Aug 25, 2022 · aea8432 · aea8432
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commit aea8432
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diff --git a/.git-blame-ignore-revs b/.git-blame-ignore-revs
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+# Run through `clang-format`:
+# https://github.com/coreos/rpm-ostree/pull/3475
+be45a74d0802c764d04cdfc6f3bcc12872b3bb33