fix: add HTTP timeout configuration to mitigate version.json fetch failures

[Copilot]

HeadlessMC intermittently times out when fetching version.json from Mojang servers, causing CI failures that require manual reruns.

Changes

Added Java HTTP timeout system properties to all HeadlessMC launcher invocations:

- java -jar headlessmc-launcher-${{ inputs.hmc-version }}.jar --command download ${{ inputs.mc }}
+ java -Dsun.net.client.defaultConnectTimeout=30000 -Dsun.net.client.defaultReadTimeout=30000 -jar headlessmc-launcher-${{ inputs.hmc-version }}.jar --command download ${{ inputs.mc }}

Modified 4 commands in action.yml:

• Version download
• Modloader installation
• Game launch (xvfb and non-xvfb)

Both timeouts set to 30 seconds (30000ms) to handle transient network issues while preventing indefinite hangs.

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/3arthqu4ke/headlessmc/releases/latest
  • Triggering command: curl -s REDACTED (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Frequent test failures due to timeout while fetching version</issue_title>
<issue_description>I've introduced the mc-runtime-test and mc-server-test actions into several Hex Casting-related projects, and all of them have recently started running into frequent but intermittent failures caused by an HTTP timeout while fetching version.json. Manually rerunning the job often resolves the timeout.

Example of a workflow run that failed due to this issue: https://github.com/FallingColors/HexMod/actions/runs/18510809336/job/52751586190

Traceback:

[21:45:54] [main/INFO] [ServerLauncher]: Launching server to create EULA...
[21:45:59] [main/SEVERE] [AbstractLaunchProcessLifecycle]: Failed to start Minecraft on try 0
me.earth.headlessmc.api.command.CommandException: Failed to read Version 1.20.1
	at me.earth.headlessmc.launcher.server.ServerLauncher.getVersion(ServerLauncher.java:258)
	at me.earth.headlessmc.launcher.server.ServerLauncher.launch0(ServerLauncher.java:116)
	at me.earth.headlessmc.launcher.server.ServerLauncher.eulaLaunch(ServerLauncher.java:72)
	at me.earth.headlessmc.launcher.server.ServerLauncher.launch(ServerLauncher.java:90)
	at me.earth.headlessmc.launcher.server.commands.LaunchServerCommand$ServerLaunchProcessLifecycle.createProcess(LaunchServerCommand.java:52)
	at me.earth.headlessmc.launcher.command.AbstractLaunchProcessLifecycle.runProcess(AbstractLaunchProcessLifecycle.java:133)
	at me.earth.headlessmc.launcher.command.AbstractLaunchProcessLifecycle.run(AbstractLaunchProcessLifecycle.java:60)
	at me.earth.headlessmc.launcher.server.commands.LaunchServerCommand.execute(LaunchServerCommand.java:25)
	at me.earth.headlessmc.launcher.server.commands.LaunchServerCommand.execute(LaunchServerCommand.java:16)
	at me.earth.headlessmc.launcher.command.FindByCommand.execute(FindByCommand.java:42)
	at me.earth.headlessmc.api.command.CommandContextImpl.executeCommand(CommandContextImpl.java:54)
	at me.earth.headlessmc.api.command.CommandContextImpl.execute(CommandContextImpl.java:33)
	at me.earth.headlessmc.launcher.server.commands.ServerCommandContext.execute(ServerCommandContext.java:37)
	at me.earth.headlessmc.launcher.server.ServerCommand.execute(ServerCommand.java:45)
	at me.earth.headlessmc.api.command.CommandContextImpl.executeCommand(CommandContextImpl.java:54)
	at me.earth.headlessmc.api.command.CommandContextImpl.execute(CommandContextImpl.java:33)
	at me.earth.headlessmc.api.command.line.CommandLine.lambda$new$0(CommandLine.java:45)
	at me.earth.headlessmc.launcher.QuickExitCliHandler.checkQuickExit(QuickExitCliHandler.java:47)
	at me.earth.headlessmc.launcher.Main.runHeadlessMc(Main.java:57)
	at me.earth.headlessmc.launcher.Main.main(Main.java:20)
Caused by: java.net.http.HttpConnectTimeoutException: HTTP connect timed out
	at java.net.http/jdk.internal.net.http.HttpClientImpl.send(HttpClientImpl.java:568)
	at java.net.http/jdk.internal.net.http.HttpClientFacade.send(HttpClientFacade.java:123)
	at net.lenni0451.commons.httpclient.executor.HttpClientExecutor.execute(HttpClientExecutor.java:48)
	at net.lenni0451.commons.httpclient.HttpClient.execute(HttpClient.java:232)
	at net.lenni0451.commons.httpclient.requests.HttpRequest.execute(HttpRequest.java:213)
	at me.earth.headlessmc.launcher.download.DownloadService.get(DownloadService.java:70)
	at me.earth.headlessmc.launcher.download.DownloadService.download(DownloadService.java:55)
	at me.earth.headlessmc.launcher.command.download.VersionInfoUtil.toVersion(VersionInfoUtil.java:27)
	at me.earth.headlessmc.launcher.server.ServerLauncher.getVersion(ServerLauncher.java:256)
	... 19 more
Caused by: java.net.http.HttpConnectTimeoutException: HTTP connect timed out
	at java.net.http/jdk.internal.net.http.MultiExchange.toTimeoutException(MultiExchange.java:580)
	at java.net.http/jdk.internal.net.http.MultiExchange.getExceptionalCF(MultiExchange.java:527)
	at java.net.http/jdk.internal.net.http.MultiExchange.lambda$responseAsyncImpl$7(MultiExchange.java:447)
	at java.base/java.util.concurrent.CompletableFuture.uniHandle(CompletableFuture.java:934)
	at java.base/java.util.concurrent.CompletableFuture$UniHandle.tryFire(CompletableFuture.java:911)
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
	at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2162)
	at java.net.http/jdk.internal.net.http.common.SSLFlowDelegate.stopOnError(SSLFlowDelegate.java:997)
	at java.base/java.util.concurrent.CompletableFuture.uniExceptionally(CompletableFuture.java:990)
	at java.base/java.util.concurrent.CompletableFuture$UniExceptionally.tryFire(CompletableFuture.java:974)
	at java.base/java.util.concurrent.CompletableFuture.postComplete(CompletableFuture.java:510)
	at java.base/java.util.concurrent.CompletableFuture.completeExceptionally(CompletableFuture.java:2162)
	at java.net.http/jdk.internal.n...

</details>

- Fixes headlesshq/mc-runtime-test#82

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