Cirrus: Abstract destination branch refs.

Various tasks and scripts behave differently depending on whether or not
the build is running against a PR or on a branch, post-merge.  However,
a great number of them are hard-coded to the string 'master' as the
destination.  Since this is not always the case (there are other
relevant branches), it makes sense to abstract the references with a
single definition.

Add a top-level `$DEST_BRANCH` variable to CI, and otherwise
default to 'master' when unset.  This enables running CI builds on
additional branches without the overhead of updating all the static
references to 'master'.  Simply update `$DEST_BRANCH` at the top-level
and all branch-conditional logic will function as intended.

Signed-off-by: Chris Evich <cevich@redhat.com>

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