Disable doxygen generation on every push (#5694)
Disable doxygen generation on every push (#5694)

Move Doxygen generation to trigger only on tags.  This should help
with the enormous bloat we're seeing in gh-pages branch
nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip