Add optional ghcr.io/ to the version grep

Author: dwc0011

bootstrap/Makefile.bootstrap

@@ -3,8 +3,7 @@ export PWD = $(shell pwd)
 export TARDIGRADE_CI_ORG ?= plus3it
 export TARDIGRADE_CI_PROJECT ?= tardigrade-ci
 export TARDIGRADE_CI_DOCKERFILE ?= Dockerfile
-export TARDIGRADE_CI_BRANCH ?= $(or $(shell grep 'FROM $(TARDIGRADE_CI_ORG)/$(TARDIGRADE_CI_PROJECT)' $(TARDIGRADE_CI_DOCKERFILE) 2> /dev/null | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' 2> /dev/null),master)
-
+export TARDIGRADE_CI_BRANCH ?= $(or $(shell grep -E 'FROM (ghcr.io/)?$(TARDIGRADE_CI_ORG)/$(TARDIGRADE_CI_PROJECT)' $(TARDIGRADE_CI_DOCKERFILE) 2> /dev/null | grep -oE '[0-9]+\.[0-9]+\.[0-9]+' 2> /dev/null),master)
 TARDIGRADE_CI_PATH ?= $(shell until [ -d "$(TARDIGRADE_CI_PROJECT)" ] || [ "`pwd`" == '/' ]; do cd ..; done; pwd)/$(TARDIGRADE_CI_PROJECT)
 TARDIGRADE_CI_PATH_LOCAL := $(PWD)/$(TARDIGRADE_CI_PROJECT)
 TARDIGRADE_CI_BOOTSTRAP := $(PWD)/.$(TARDIGRADE_CI_PROJECT)