TerraTech 73b70393d4 Makefile: Strip 'heads/' from git rev-parse --abbrev-ref HEAD ...

git rev-parse --abbrev-ref HEAD can return results in a couple different ways:
  1) tag v1.1.0-rc3 exists and branch==v1.1.0-rc3
     result: heads/v1.1.0-rc3
  2) tag v1.1.0-rc3 doesn't exist and branch==v1.1.0-rc3
     result: v1.1.0-rc3

  Strip it off GIT_BRANCH regardless as it will break the build.  e.g.

  $ make binary
  docker build  -t "traefik-dev:heads/v1.1.0-rc3" -f build.Dockerfile .
  invalid value "traefik-dev:heads/v1.1.0-rc3" for flag -t: Error parsing reference: "traefik-dev:heads/v1.1.0-rc3" is not a valid repository/tag
  See 'docker build --help'.
  Makefile:51: recipe for target 'build' failed
  make: *** [build] Error 125

2016-11-11 16:22:51 -05:00

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