corrected download url

Dockerfile

@@ -18,10 +18,8 @@ RUN apt-get update && apt-get install -y libaio1 && rm -rf /var/lib/apt/lists/*
 # gpg: key 5072E1F5: public key "MySQL Release Engineering <[email protected]>" imported
 RUN gpg --keyserver pgp.mit.edu --recv-keys A4A9406876FCBD3C456770C88C718D3B5072E1F5
 
-# note: we're pulling the *.asc file from mysql.he.net instead of dev.mysql.com because the official mirror 404s that file for whatever reason - maybe it's at a different path?
 RUN apt-get update && apt-get install -y curl --no-install-recommends && rm -rf /var/lib/apt/lists/* \
-	&& curl -SL "http://dev.mysql.com/get/Downloads/MySQL-5.1/mysql-5.1.73-linux2.6-x86_64.tar.gz" -o mysql.tar.gz \
-	&& curl -SL "http://mysql.he.net/Downloads/MySQL-5.1/mysql-5.1.73-linux2.6-x86_64.tar.gz.asc" -o mysql.tar.gz.asc \
+	&& curl -SL "http://dev.mysql.com/get/Downloads/MySQL-5.1/mysql-5.1.73-linux-x86_64-glibc23.tar.gz" -o mysql.tar.gz \
 	&& apt-get purge -y --auto-remove curl \
 	&& mkdir /usr/local/mysql \
 	&& tar -xzf mysql.tar.gz -C /usr/local/mysql --strip-components=1 \