apache ant can not execute.

Hi, I’m @djdjdjek

I feel this software is very amazing, a linux on iPad!
I want to run java / javac on ish, by using ant to compile my java code.

I have download ish app from app store. And install open jdk 1.8, then execute 'java -mx512m -version',

```
apk search openjdk
apk add openjdk8
java -mx512m -version
javac -version
```

write below into /etc/profile.d/profile.sh
```
export JAVA_HOME=/usr/lib/jvm/java-1.8-openjdk
export PATH="$JAVA_HOME/bin:${PATH}"
```

I can get the version message.
But when I install apache ant , and execute it.

```
wget https://dlcdn.apache.org//ant/binaries/apache-ant-1.10.12-bin.tar.gz
tar -zxvf apache-ant-1.10.12-bin.tar.gz
mv apache-ant-1.10.12 ant
ANT_HOME=/root/downloads/ant
PATH=$PATH:${ANT_HOME}/bin
ant
```

I will get this message :
```
We cannot run Java, please ensure you have Java installed.
We have tried to execute /usr/lib/jvm/java-1.8-openjdk/jre/bin/java -mx128m but failed.
If you have installed Java in a unusual place you can set JAVA_HOME
to the directory containing the Java installation.
```

I am very sure I have install java , by the way, if I want to run java, I must add -mx128m , because the default memory is 6M .

Does someone can help me to solve this problem. Please...I really want to use ish for develop.

My ipad is ipad mini5 64G wifi.

Start by reproducing the reported `openjdk8`, `JAVA_HOME`, `java -mx128m -version`, and `ant` commands from the issue. Trace how the Ant launcher invokes `/usr/lib/jvm/java-1.8-openjdk/jre/bin/java` and determine whether iSH can support that invocation; done means identifying a reproducible fix or documenting the compatibility limitation.

Written by the indexing model from the issue text.