Build versioning

Dockerfile

@@ -1,8 +1,24 @@
 # syntax=docker/dockerfile:1
 
+FROM ghcr.io/linuxserver/baseimage-alpine:3.17 as buildstage
+
+ARG MOD_VERSION=master
+
+RUN \
+  echo "**** grab rffmpeg ****" && \
+  mkdir -p /root-layer/usr/local/bin/ && \
+  curl -o \
+    /root-layer/usr/local/bin/rffmpeg -L \
+    "https://raw.githubusercontent.com/joshuaboniface/rffmpeg/${MOD_VERSION}/rffmpeg" && \
+  chmod +x /root-layer/usr/local/bin/rffmpeg
+
+# copy local files
+COPY root/ /root-layer/
+
+## Single layer deployed image ##
 FROM scratch
 
 LABEL maintainer="junkman690"
 
-# copy local files
-COPY root/ /
+# Add files from buildstage
+COPY --from=buildstage /root-layer/ /