build

Pin Alpine image digest and add SHA256 verification for TF provider #24204

Job	Run time
testmask	24s
cleanups	2s
integration-trigger-dependabot	0s
validate-generated-is-up-to-date	52s
validate-python-codegen	11s
make test (linux, terraform)	10m 37s
make test (windows, terraform)	16m 31s
make test (macos, terraform)	15m 20s
integration-trigger	8s
make test (windows, direct)	11m 15s
make test (macos, direct)	8m 42s
make test (linux, direct)	6m 16s
make test-pipelines	-1s
make test-exp-ssh	-1s
make test-exp-aitools	-1s
test-result	4s
	1h 10m 19s

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