Fix Dockerfile graalvm install step

Also removed the unused _ARCH var from the test suite_setup.

test/Dockerfile

@@ -1,12 +1,14 @@
 from centos:7
 
+ARG GRAALVM_VERSION=22.3.3
+
 RUN yum install -y https://cdn.azul.com/zulu/bin/zulu-repo-1.0.0-1.noarch.rpm
 RUN yum install -y zulu18-jdk
 RUN yum install -y zulu11-jdk
 RUN yum install -y java-11-openjdk
 RUN yum install -y java-1.7.0-openjdk
 RUN yum install -y java-1.8.0-openjdk
-RUN curl -L https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-22.3.3/graalvm-ce-java11-linux-$(arch)-22.3.3.tar.gz | tar xzf - -C /usr/lib/jvm/
+RUN curl -L https://github.com/graalvm/graalvm-ce-builds/releases/download/vm-$GRAALVM_VERSION/graalvm-ce-java11-linux-$(uname -m | sed 's/x86_64/amd64/')-$GRAALVM_VERSION.tar.gz | tar xzf - -C /usr/lib/jvm/
 
 RUN echo 'export PATH="$HOME/.jenv/bin:$PATH"' >> ~/.bash_profile
 RUN echo 'eval "$(jenv init -)"' >> ~/.bash_profile

test/setup_suite.bash

@@ -1,8 +1,6 @@
 #!/usr/bin/env bats
 
 setup_suite() {
-  export _ARCH=$(arch)
-
   export PATH=$HOME/.jenv/bin/:$PATH
 
   eval "$(jenv init -)"