feat(influxdb): Add global BuildInfo

Permits binary packages to set a global BuildInfo state that
can be inspected by other packages

build.go

@@ -6,3 +6,17 @@ type BuildInfo struct {
 	Commit  string // Commit is the current git commit SHA
 	Date    string // Date is the build date in RFC3339
 }
+
+var buildInfo BuildInfo
+
+// SetBuildInfo sets the build information for the binary.
+func SetBuildInfo(version, commit, date string) {
+	buildInfo.Version = version
+	buildInfo.Commit = commit
+	buildInfo.Date = date
+}
+
+// GetBuildInfo returns the current build information for the binary.
+func GetBuildInfo() BuildInfo {
+	return buildInfo
+}