Remove git commit message from binary

This appears to have broken CI at least three times now and
prevented us from shipping a release binary for a tag.

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

gateway/Dockerfile

@@ -11,7 +11,6 @@ ARG TARGETOS
 ARG TARGETARCH
 
 ARG GIT_COMMIT
-ARG GIT_COMMIT_MESSAGE
 ARG VERSION
 
 COPY --from=license-check /license-check /usr/bin/
@@ -45,7 +44,6 @@ RUN go test $(go list ./... | grep -v integration | grep -v /vendor/ | grep -v /
 
 RUN CGO_ENABLED=${CGO_ENABLED} GOOS=${TARGETOS} GOARCH=${TARGETARCH} go build --ldflags "-s -w \
     -X \"github.com/openfaas/faas/gateway/version.GitCommitSHA=${GIT_COMMIT}\" \
-    -X \"github.com/openfaas/faas/gateway/version.GitCommitMessage=${GIT_COMMIT_MESSAGE}\" \
     -X \"github.com/openfaas/faas/gateway/version.Version=${VERSION}\" \
     -X github.com/openfaas/faas/gateway/types.Arch=${TARGETARCH}" \
     -a -installsuffix cgo -o gateway .

gateway/main.go

@@ -26,11 +26,9 @@ const NameExpression = "-a-zA-Z_0-9."
 
 func main() {
 	if len(version.GitCommitMessage) == 0 {
-		version.GitCommitMessage = "Place-holder for commit message"
+		version.GitCommitMessage = "See GitHub for latest changes"
 	}
 
-	// log.Printf("Commit: %s", version.GitCommitMessage)
-
 	osEnv := types.OsEnv{}
 	readConfig := types.ReadConfig{}
 	config, configErr := readConfig.Read(osEnv)