Make smalled image by excluding docs and soft dependencies

Dockerfile

 FROM fedora:34
 
-RUN dnf install -y \
+RUN dnf install -y --nodocs --setopt install_weak_deps=False \
     latexmk \
     texlive-collection-latexrecommended \
     texlive-collection-langczechslovak \
@@ -13,7 +13,7 @@ RUN dnf install -y \
     texlive-multirow \
     texlive-pgfplots \
     texlive-stmaryrd \
-    && dnf clean all && rm -rf /var/cache/yum
+    && dnf clean all
 
 WORKDIR /data