BUGFIX: don't copy the '.' folder

[inteon]

Fixes a bug introduced in #269.
We were also selecting the root directory (.) and copying that folder.

Old command:

find . -maxdepth 1 -not \( -path "./_bin" -prune \)
.
./.github
./modules
./tests
./OWNERS
./bootstrap.sh
./_upgrade
./scripts
./.git
./.gitignore
./LICENSE
./upgrade_all_repos.sh
./README.md
./Makefile

New command:

find . -maxdepth 1 -not \( -path "./_bin" \) -not \( -path "." \)
./.github
./modules
./tests
./OWNERS
./bootstrap.sh
./_upgrade
./scripts
./.git
./.gitignore
./LICENSE
./upgrade_all_repos.sh
./README.md
./Makefile

This likely caused #269 (comment)

[SgtCoDFish]

/lgtm
/approve

Makes sense to me!

[cert-manager-prow]

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