Allow commit/branch to be build

ecs/Dockerfile

@@ -14,10 +14,16 @@ LABEL maintainer="ProcessOne <[email protected]>" \
 RUN git clone https://github.com/processone/ejabberd.git
 WORKDIR /ejabberd
 COPY vars.config .
-RUN echo '{vsn, "'${VERSION}'.0"}.' >>vars.config
 COPY config.exs config/
 COPY rel/*exs rel/
 RUN git checkout ${VERSION/latest/HEAD} \
+    \
+    && if [[ "$VERSION" =~ ^[0-9]+\.[0-9]+$ ]]; then \
+        echo '{vsn, "'"$VERSION.0"'"}.' >> vars.config; \
+    else \
+        echo '{vsn, "0.0.0"}.' >> vars.config; \
+    fi \
+    \
     && mix deps.get \
     && (cd deps/eimp; ./configure)