[ENGINE-978] Change revision scheme per ENGINE-970 requirements

Signed-off-by: plaurent <[email protected]>

hack/build

@@ -6,12 +6,16 @@ set -e
 : "${PACKAGE=github.com/docker/buildx}"
 : "${VERSION=$(./hack/git-meta version)}"
 : "${REVISION=$(./hack/git-meta revision)}"
+: "${PRERELEASE=$(./hack/git-meta version | rev | cut -c3- | rev | cut -d'-' -f 2 | grep -E '(^tp|^rc).*')}"
+: "${REVISION_NUMBER=1}"
+VERSION=$(printf "v%sm%s%s" "$(./hack/git-meta version | rev | cut -c3- | rev | cut -d'-' -f 1 | cut -c2-)" "${REVISION_NUMBER}" "-${PRERELEASE}")
 
 : "${CGO_ENABLED=0}"
 : "${GO_PKG=github.com/docker/buildx}"
 : "${GO_EXTRA_FLAGS=}"
 : "${GO_LDFLAGS=-X ${GO_PKG}/version.Version=${VERSION} -X ${GO_PKG}/version.Revision=${REVISION} -X ${GO_PKG}/version.Package=${PACKAGE}}"
 : "${GO_EXTRA_LDFLAGS=}"
 
+
 set -x
 CGO_ENABLED=$CGO_ENABLED go build -mod vendor -trimpath ${GO_EXTRA_FLAGS} -ldflags "${GO_LDFLAGS} ${GO_EXTRA_LDFLAGS}" -o "${DESTDIR}/docker-buildx" ./cmd/buildx