Fixes #30 - Works around wangyoucao577/go-release-action#143

The GitHub action we use is downloading the go source code to the
project's checked out clone. This is causing our `GitTreeState` to
always report as "dirty."

The file in question is always named `go-linux.tar.gz` (even on Windows
and Mac), since this is incorrect we can preemptively remove the tar
using a glob.

.github/workflows/promote-prerelease.yml

@@ -53,7 +53,9 @@ jobs:
           goos: ${{ matrix.goos }}
           goarch: ${{ matrix.goarch }}
           goversion: ${{ env.GO_VERSION }}
+          pre_command: "rm -f go-*.tar.gz"
           build_command: "make ${{ env.REPO_NAME }}"
           release_tag: ${{ env.TAG }}
           md5sum: 'FALSE'
-          sha256sum: 'TRUE'
+          sha256sum: 'TRUE'
+

.github/workflows/promote-release.yml

@@ -51,7 +51,9 @@ jobs:
           goos: ${{ matrix.goos }}
           goarch: ${{ matrix.goarch }}
           goversion: ${{ env.GO_VERSION }}
+          pre_command: "rm -f go-*.tar.gz"
           build_command: "make ${{ env.REPO_NAME }}"
           release_tag: ${{ env.TAG }}
           md5sum: 'FALSE'
-          sha256sum: 'TRUE'
+          sha256sum: 'TRUE'
+