Tools like Bamboo do not like dashes in envvar names. As a result, it
becomes difficult to use these tools with pgbedrock if your role names
have dashes. This commit changes dashes in password envvars to
underscores, e.g. the role foo-bar would have password envvar
FOO_BAR_PASSWORD instead of FOO-BAR_PASSWORD
Tools like Bamboo do not like dashes in envvar names. As a result, it becomes difficult to use these tools with pgbedrock if your role names have dashes. This commit changes dashes in password envvars to underscores, e.g. the role foo-bar would have password envvar FOO_BAR_PASSWORD instead of FOO-BAR_PASSWORD