set absolute path for binaries

Dockerfile

@@ -27,8 +27,8 @@ RUN groupadd -g 1000 $USER && \
 COPY *.tar.gz /local/libs
 COPY rpackages /tmp/rpackages
 
-RUN R -e "library(tools); write_PACKAGES('/local/libs')" && \
-    cat /tmp/rpackages | awk '{printf "\x27"$1"\x27,"}' | sed 's/.$//' | xargs -0 -I {} R -e "install.packages(c({}), contriburl='file:///local/libs')" && \
+RUN /usr/local/bin/R -e "library(tools); write_PACKAGES('/local/libs')" && \
+    cat /tmp/rpackages | awk '{printf "\x27"$1"\x27,"}' | sed 's/.$//' | xargs -0 -I {} /usr/local/bin/R -e "install.packages(c({}), contriburl='file:///local/libs')" && \
     rpm -e --nodeps binutils curl glibc-devel glibc-headers libcurl-devel libX11 libX11-common kernel-headers && \
     echo "auth-none=1" >> /etc/rstudio/disable_auth_rserver.conf && \
     echo "server-daemonize=0" >> /etc/rstudio/rserver.conf && \
@@ -44,8 +44,8 @@ ENV LC_ALL=en_US.UTF-8 \
 
 USER ${USER}
 
-HEALTHCHECK --start-period=60s CMD rstudio-server status | grep -e "running"
+HEALTHCHECK --start-period=60s CMD /usr/local/bin/rstudio-server status | grep -e "running"
 
 EXPOSE 8787
 
-ENTRYPOINT ["rstudio-server", "start"]
\ No newline at end of file
+ENTRYPOINT ["/usr/local/bin/rstudio-server", "start"]
\ No newline at end of file