docs: Removed unsupported db (mysql) #40

Job	Run time
Detect relevant changed files	4s
Build/Publish ${{ matrix.runner.arch }} Image	0s
Run cargo-udeps	0s
Package/Publish ${{ needs.build-container-image.outputs.operator-version }} Helm Chart	0s
Publish/Sign ${{ needs.build-container-image.outputs.operator-version }} Index	0s
Run OpenShift Preflight Check for ${{ needs.build-container-image.outputs.operator-version }}-${{ matrix.arch }}	0s
Finished Build and Publish	0s
Failure Notification	0s
	4s

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