chore: Update various dependencies.

* chore: delete webhooks (#9999)

delete webhooks used to display what the docs would look like with a PR change

* chore: bump github.com/cloudflare/circl from 1.6.1 to 1.6.3 (#9993)

Bumps [github.com/cloudflare/circl](https://github.com/cloudflare/circl) from 1.6.1 to 1.6.3.
- [Release notes](https://github.com/cloudflare/circl/releases)
- [Commits](cloudflare/circl@v1.6.1...v1.6.3)

---
updated-dependencies:
- dependency-name: github.com/cloudflare/circl
  dependency-version: 1.6.3
  dependency-type: indirect
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* Migration to Kokoro instances (#9991)

* debug migrating to Kokoro instances - pared down PR

* switch to new project in presubmit.sh

* pared down to just one test

* tag skaffold-builder image with commit and push to AR

* use buildx with --load

* jib errors

* remove wrong project

* jib updates

* chore: bump flask from 2.2.5 to 3.1.3 in /integration/examples/hot-reload/python (#9989)

chore: bump flask in /integration/examples/hot-reload/python

Bumps [flask](https://github.com/pallets/flask) from 2.2.5 to 3.1.3.
- [Release notes](https://github.com/pallets/flask/releases)
- [Changelog](https://github.com/pallets/flask/blob/main/CHANGES.rst)
- [Commits](pallets/flask@2.2.5...3.1.3)

---
updated-dependencies:
- dependency-name: flask
  dependency-version: 3.1.3
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

* chore: bump rack from 2.2.20 to 2.2.22 in /examples/ruby/backend (#9981)

Bumps [rack](https://github.com/rack/rack) from 2.2.20 to 2.2.22.
- [Release notes](https://github.com/rack/rack/releases)
- [Changelog](https://github.com/rack/rack/blob/main/CHANGELOG.md)
- [Commits](rack/rack@v2.2.20...v2.2.22)

---
updated-dependencies:
- dependency-name: rack
  dependency-version: 2.2.22
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

---------

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: menahyouyeah

Makefile

@@ -153,41 +153,45 @@ integration: install integration-tests
 
 .PHONY: release
 release: $(BUILD_DIR)/VERSION
-	docker build \
+	docker buildx build \
 		--build-arg VERSION=$(VERSION) \
 		-f deploy/skaffold/Dockerfile \
 		--target release \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:$(VERSION) \
                 -t gcr.io/$(GCP_PROJECT)/skaffold:latest \
+		--load \
 		.
 
 .PHONY: release-build
 release-build:
-	docker build \
+	docker buildx build \
 		-f deploy/skaffold/Dockerfile \
 		--target release \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:edge \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:$(COMMIT) \
+		--load \
 		.
 
 .PHONY: release-lts
 release-lts: $(BUILD_DIR)/VERSION
-	docker build \
+	docker buildx build \
 		--build-arg VERSION=$(VERSION) \
 		-f deploy/skaffold/Dockerfile.lts \
 		--target release \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:lts \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:$(VERSION)-lts \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:$(SCANNING_MARKER)-lts \
+		--load \
 		.
 
 .PHONY: release-lts-build
 release-lts-build:
-	docker build \
+	docker buildx build \
 		-f deploy/skaffold/Dockerfile.lts \
 		--target release \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:edge-lts \
 		-t gcr.io/$(GCP_PROJECT)/skaffold:$(COMMIT)-lts \
+		--load \
 		.
 
 .PHONY: clean
@@ -197,30 +201,34 @@ clean:
 .PHONY: build_deps
 build_deps:
 	$(eval DEPS_DIGEST := $(shell ./hack/skaffold-deps-sha1.sh))
-	docker build \
+	docker buildx build \
 		-f deploy/skaffold/Dockerfile.deps \
 		-t gcr.io/$(GCP_PROJECT)/build_deps:$(DEPS_DIGEST) \
+		--load \
 		deploy/skaffold
 	docker push gcr.io/$(GCP_PROJECT)/build_deps:$(DEPS_DIGEST)
 
 skaffold-builder-ci:
-	docker build \
+	docker buildx build \
 		--cache-from gcr.io/$(GCP_PROJECT)/build_deps \
 		-f deploy/skaffold/Dockerfile.deps \
 		-t gcr.io/$(GCP_PROJECT)/build_deps \
+		--load \
 		.
-	time docker build \
+	time docker buildx build \
 		-f deploy/skaffold/Dockerfile \
 		--target builder \
 		-t gcr.io/$(GCP_PROJECT)/skaffold-builder \
+		--load \
 		.
 
 .PHONY: skaffold-builder
 skaffold-builder:
-	time docker build \
+	time docker buildx build \
 		-f deploy/skaffold/Dockerfile \
 		--target builder \
 		-t gcr.io/$(GCP_PROJECT)/skaffold-builder \
+		--load \
 		.
 
 .PHONY: integration-in-kind
@@ -276,6 +284,12 @@ integration-in-k3d: skaffold-builder
 			make integration \
 		'
 
+# Prevent Jib (Maven/Gradle) from crashing on Kokoro.
+# Kokoro is a "clean" environment and doesn't have a Maven settings file (~/.m2/settings.xml).
+# When Skaffold tries to sync that non-existent file into a Docker container, Docker 
+# mistakenly creates a FOLDER named 'settings.xml' instead. Jib then crashes because 
+# it can't read a folder as a configuration file. 
+# Pointing home to /tmp avoids this file-vs-folder conflict.
 .PHONY: integration-in-docker
 integration-in-docker: skaffold-builder-ci
 	docker run --rm \
@@ -291,6 +305,8 @@ integration-in-docker: skaffold-builder-ci
 		-e GOOGLE_APPLICATION_CREDENTIALS=$(GOOGLE_APPLICATION_CREDENTIALS) \
 		-e INTEGRATION_TEST_ARGS=$(INTEGRATION_TEST_ARGS) \
 		-e IT_PARTITION=$(IT_PARTITION) \
+		-e MAVEN_OPTS="-Duser.home=/tmp" \
+		-e GRADLE_USER_HOME="/tmp/.gradle" \
 		gcr.io/$(GCP_PROJECT)/skaffold-builder \
 		make integration-tests