Add script to generate patch release notes

[msau42]

Sample PR: https://github.com/kubernetes-csi/external-provisioner/pull/1061

[k8s-ci-robot]

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[msau42]

/release-note-none /assign @sunnylovestiramisu

[msau42]

@pohly are these tests failing an indication that we did not update release-tools correctly in the other repos?

I tried running the git subtree commands manually on my own fresh external-provisioner branch and it gave strange results.

$ git subtree pull --squash --prefix=release-tools ../csi-release-tools master

$ git log
commit a95373ff5a2909e53afc8d7c8876cc0f4cea4022
Author: Michelle Au <msau@google.com>
Date:   Thu Oct 19 05:52:21 2023 +0000

    Squashed 'release-tools/' changes from f9d5b9c05..c10b67804

    REVERT: f9d5b9c05 Merge pull request #236 from mowangdk/feature/bump_csi-driver-host-path_version
    REVERT: b01fd5372 Bump csi-driver-host-path version up to v1.12.0
    REVERT: 984feece4 Merge pull request #234 from siddhikhapare/csi-tools
    REVERT: 1f7e60599 fixed broken links of testgrid dashboard
    REVERT: de2fba88b Merge pull request #233 from andyzhangx/andyzhangx-patch-1
    REVERT: cee895e1f remove windows 20H2 build since it's EOL long time ago
    REVERT: 670bb0ef1 Merge pull request #229 from marosset/fix-codespell-errors
    REVERT: 35d5e783c Merge pull request #219 from yashsingh74/update-registry
    REVERT: 63473cc96 Merge pull request #231 from coulof/bump-go-version-1.20.5
    REVERT: 29a5c76c7 Merge pull request #228 from mowangdk/chore/adopt_kubernetes_recommand_labels
    REVERT: 8dd28211b Update cloudbuild image with go 1.20.5
    REVERT: 1df23dba6 Merge pull request #230 from msau42/prow
    REVERT: 1f92b7e7c Add ginkgo timeout to e2e tests to help catch any stuck tests
    REVERT: 2b8b80ead fixing some codespell errors
    REVERT: 72984ec0a chore: adopt kubernetes recommand label
    REVERT: 901bcb5a9 Update registry k8s.gcr.io -> registry.k8s.io

    git-subtree-dir: release-tools
    git-subtree-split: c10b67804e07a324fe33595040afd13f020ee000

[pohly]

At first glance, https://github.com/kubernetes-csi/external-provisioner/pull/1050 looks normal.

It also works for me:

$ cd /nvme/gopath/src/github.com/kubernetes-csi/csi-release-tools
$ gh pr checkout --detach https://github.com/kubernetes-csi/csi-release-tools/pull/237
remote: Enumerating objects: 6, done.
....
HEAD is now at 2c625d41 Add script to generate patch release notes

$ cd /nvme/gopath/src/github.com/kubernetes-csi/external-provisioner
$ git fetch origin && git checkout origin/master
...
$ git subtree pull --squash --prefix=release-tools /nvme/gopath/src/github.com/kubernetes-csi/csi-release-tools 2c625d41dda606064eeb1c602e307bc399f4b451
....
Resolving deltas: 100% (282/282), completed with 12 local objects.
From /nvme/gopath/src/github.com/kubernetes-csi/csi-release-tools
 * branch                2c625d41dda606064eeb1c602e307bc399f4b451 -> FETCH_HEAD
hint: Waiting for your editor to close the file... Waiting for Emacs...
Merge made by the 'recursive' strategy.
 release-tools/SIDECAR_RELEASE_PROCESS.md      |  77 ++++++++++++++++++++++++++++++++++-------------------------------------------
 release-tools/generate_patch_release_notes.sh | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 2 files changed, 140 insertions(+), 43 deletions(-)
 create mode 100755 release-tools/generate_patch_release_notes.sh
pohly@pohly-desktop:/nvme/gopath/src/github.com/kubernetes-csi/external-provisioner$ git log
commit 9ad994318759084d8806e6156f38d0ef86dddda0 (HEAD)
Merge: ae4c14dfe ff7abf467
Author: Patrick Ohly <patrick.ohly@intel.com>
Date:   Thu Oct 19 16:01:31 2023 +0200

    Merge commit 'ff7abf46771655009bc14798960f41887d7e0063' into HEAD

commit ff7abf46771655009bc14798960f41887d7e0063
Author: Patrick Ohly <patrick.ohly@intel.com>
Date:   Thu Oct 19 16:01:31 2023 +0200

    Squashed 'release-tools/' changes from f9d5b9c05..2c625d41d

    2c625d41d Add script to generate patch release notes

    git-subtree-dir: release-tools
    git-subtree-split: 2c625d41dda606064eeb1c602e307bc399f4b451

commit ae4c14dfe82168a00304ebaf0d991ef61869ab78 (origin/master, origin/HEAD)
...

It also works when I merge your PR into master and then use git subtree pull --squash ... master.

[xing-yang]

/retest

[sunnylovestiramisu]

/lgtm