Fix typo in Dockerfile for libtcmalloc package

Author: northeastprince

Dockerfile

@@ -29,7 +29,7 @@ RUN SECRET_KEY_BASE_DUMMY=1 ./bin/rails assets:precompile
 FROM base
 
 RUN apt-get update -qq && \
-    apt-get install --no-install-recommends -y postgresql-common libvips curl ca-certificates lsb-release libtcmalloc_minimal4t64 && \
+    apt-get install --no-install-recommends -y postgresql-common libvips curl ca-certificates lsb-release libtcmalloc-minimal4t64 && \
     install -d /usr/share/postgresql-common/pgdg && curl -o /usr/share/postgresql-common/pgdg/apt.postgresql.org.asc --fail https://www.postgresql.org/media/keys/ACCC4CF8.asc && \
     sh -c 'echo "deb [signed-by=/usr/share/postgresql-common/pgdg/apt.postgresql.org.asc] https://apt.postgresql.org/pub/repos/apt $(lsb_release -cs)-pgdg main" > /etc/apt/sources.list.d/pgdg.list' && \
     apt-get update -qq && apt-get install --no-install-recommends -y postgresql-client && \