Update ghcr.io/getporter/porter-agent Docker tag to v1.0.12

This MR contains the following updates:

Package	Type	Update	Change
ghcr.io/getporter/porter-agent	ironbank-docker	patch	v1.0.11 -> v1.0.12
ghcr.io/getporter/porter-agent		patch	v1.0.11 -> v1.0.12

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