Fix docker permissions

Dockerfile

@@ -1,9 +1,24 @@
+FROM haskell:8.10 as builder
+RUN cabal update
+
+FROM builder as hlint-installer
+
+RUN cabal install hlint
+# hadolint ignore=DL3059
+RUN /bin/bash -c "cp $(readlink -f /root/.cabal/bin/hlint) /bin/hlint"
+
+FROM builder as stylish-haskell-installer
+
+RUN cabal install stylish-haskell
+# hadolint ignore=DL3059
+RUN /bin/bash -c "cp $(readlink -f /root/.cabal/bin/stylish-haskell) /bin/stylish-haskell"
+
+
 FROM haskell:8.10 as hlint
+COPY --from=hlint-installer /bin/hlint /bin/hlint
+ENTRYPOINT ["/bin/hlint"]
 
-RUN cabal update && cabal install hlint
-ENTRYPOINT ["hlint"]
 
 FROM haskell:8.10 as stylish-haskell
-
-RUN cabal update && cabal install stylish-haskell
-ENTRYPOINT ["stylish-haskell"]
+COPY --from=stylish-haskell-installer /bin/stylish-haskell /bin/stylish-haskell
+ENTRYPOINT ["/bin/stylish-haskell"]