Github Workflow Actions setup

[lefou]

Enabled Github Actions for mill repository. The publish job might not work yet, but I already included it to outline the setup.

What's missing:

• Add the environment variables with required publishing credentials to the Github Workflow settings /cc @lihaoyi
• Review and adapt the publish scripts

[lefou]

We have two issue on the windows build:

1. On Java 11 the docJar target fails, always. I've seen this on all of my GH Actions builds on Windows with various projects.

bsp.docJar java.lang.reflect.InvocationTargetException
    java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.base/java.lang.reflect.Method.invoke(Method.java:566)
    mill.scalalib.worker.ZincWorkerImpl.$anonfun$docJar$1(ZincWorkerImpl.scala:127)
    mill.scalalib.worker.ZincWorkerImpl.$anonfun$docJar$1$adapted(ZincWorkerImpl.scala:117)
    mill.api.FixSizedCache.withCachedValue(FixSizedCache.scala:62)
    mill.scalalib.worker.ZincWorkerImpl.withCompilers(ZincWorkerImpl.scala:370)
    mill.scalalib.worker.ZincWorkerImpl.docJar(ZincWorkerImpl.scala:117)
    mill.scalalib.ScalaModule.$anonfun$docJar$2(ScalaModule.scala:165)
    mill.define.ApplyerGenerated.$anonfun$zipMap$12(ApplicativeGenerated.scala:27)
    mill.define.Task$MappedDest.evaluate(Task.scala:392)
java.net.URISyntaxException: Illegal character in path at index 53: https://docs.oracle.com/en/java/javase/11/docs/api/C:\hostedtoolcache\windows\jdk\11.0.9\x64\jmods\java.base/java/lang/Enum.html
    java.base/java.net.URI$Parser.fail(URI.java:2913)
    java.base/java.net.URI$Parser.checkChars(URI.java:3084)
    java.base/java.net.URI$Parser.parseHierarchical(URI.java:3166)
    java.base/java.net.URI$Parser.parse(URI.java:3114)
    java.base/java.net.URI.<init>(URI.java:600)
    scala.tools.nsc.doc.html.HtmlPage.linkToHtml(HtmlPage.scala:145)
    scala.tools.nsc.doc.html.HtmlPage.toLinksIn$1(HtmlPage.scala:202)
    scala.tools.nsc.doc.html.HtmlPage.toLinksOut$1(HtmlPage.scala:194)
    scala.tools.nsc.doc.html.HtmlPage.typeToHtml(HtmlPage.scala:205)
    scala.tools.nsc.doc.html.page.EntityPage.bound0$1(Entity.scala:774)
    scala.tools.nsc.doc.html.page.EntityPage.boundsToHtml(Entity.scala:776)
    scala.tools.nsc.doc.html.page.EntityPage.boundsToHtml$(Entity.scala:771)
    scala.tools.nsc.doc.html.page.EntityPage$$anon$1.boundsToHtml(Entity.scala:1033)
    scala.tools.nsc.doc.html.page.EntityPage.tparam0$1(Entity.scala:840)
    scala.tools.nsc.doc.html.page.EntityPage.tparams0$1(Entity.scala:842)
    scala.tools.nsc.doc.html.page.EntityPage.tparamsToHtml$1(Entity.scala:845)
    scala.tools.nsc.doc.html.page.EntityPage.inside$1(Entity.scala:849)
    scala.tools.nsc.doc.html.page.EntityPage.signature(Entity.scala:910)
    scala.tools.nsc.doc.html.page.EntityPage.signature$(Entity.scala:799)
    scala.tools.nsc.doc.html.page.EntityPage$$anon$1.signature(Entity.scala:1033)
    scala.tools.nsc.doc.html.page.EntityPage.memberToHtml(Entity.scala:378)
    scala.tools.nsc.doc.html.page.EntityPage.memberToHtml$(Entity.scala:357)
    scala.tools.nsc.doc.html.page.EntityPage$$anon$1.memberToHtml(Entity.scala:1033)
    scala.tools.nsc.doc.html.page.EntityPage.$anonfun$memsDiv$1(Entity.scala:355)
    scala.tools.nsc.doc.html.page.EntityPage.memsDiv(Entity.scala:355)
    scala.tools.nsc.doc.html.page.EntityPage.memsDiv$(Entity.scala:353)
    scala.tools.nsc.doc.html.page.EntityPage$$anon$1.memsDiv(Entity.scala:1033)
    scala.tools.nsc.doc.html.page.EntityPage.$init$(Entity.scala:309)
    scala.tools.nsc.doc.html.page.EntityPage$$anon$1.<init>(Entity.scala:1033)
    scala.tools.nsc.doc.html.HtmlFactory.writeTemplates(HtmlFactory.scala:167)
    scala.tools.nsc.doc.html.HtmlFactory.generate(HtmlFactory.scala:155)
    scala.tools.nsc.doc.html.Doclet.generateImpl(Doclet.scala:30)
    scala.tools.nsc.doc.doclet.Generator.generate(Generator.scala:35)
    scala.tools.nsc.doc.DocFactory.generate$1(DocFactory.scala:139)
    scala.tools.nsc.doc.DocFactory.document(DocFactory.scala:142)
    scala.tools.nsc.ScalaDoc.process(ScalaDoc.scala:46)
    java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    java.base/java.lang.reflect.Method.invoke(Method.java:566)
    mill.scalalib.worker.ZincWorkerImpl.$anonfun$docJar$1(ZincWorkerImpl.scala:127)
    mill.scalalib.worker.ZincWorkerImpl.$anonfun$docJar$1$adapted(ZincWorkerImpl.scala:117)
    mill.api.FixSizedCache.withCachedValue(FixSizedCache.scala:62)
    mill.scalalib.worker.ZincWorkerImpl.withCompilers(ZincWorkerImpl.scala:370)
    mill.scalalib.worker.ZincWorkerImpl.docJar(ZincWorkerImpl.scala:117)
    mill.scalalib.ScalaModule.$anonfun$docJar$2(ScalaModule.scala:165)
    mill.define.ApplyerGenerated.$anonfun$zipMap$12(ApplicativeGenerated.scala:27)
    mill.define.Task$MappedDest.evaluate(Task.scala:392)

2. The scalajslib tests wont run, probably because of a too long command line.

scalajslib.test.test java.io.IOException: Cannot run program "java" (in directory "D:\a\mill\mill"): CreateProcess error=206, The filename or extension is too long
    java.lang.ProcessBuilder.start(ProcessBuilder.java:1048)
    os.proc.proc$lzycompute$1(ProcessOps.scala:128)
    os.proc.proc$1(ProcessOps.scala:122)
    os.proc.spawn(ProcessOps.scala:135)
    mill.modules.Jvm$.spawnSubprocess(Jvm.scala:140)
    mill.modules.Jvm$.runSubprocess(Jvm.scala:82)
    mill.modules.Jvm$.runSubprocess(Jvm.scala:66)
    mill.scalalib.TestModule.$anonfun$testTask$1(JavaModule.scala:659)
    mill.define.ApplyerGenerated.$anonfun$zipMap$10(ApplicativeGenerated.scala:23)
    mill.define.Task$MappedDest.evaluate(Task.scala:392)
java.io.IOException: CreateProcess error=206, The filename or extension is too long
    java.lang.ProcessImpl.create(Native Method)
    java.lang.ProcessImpl.<init>(ProcessImpl.java:444)
    java.lang.ProcessImpl.start(ProcessImpl.java:139)
    java.lang.ProcessBuilder.start(ProcessBuilder.java:1029)
    os.proc.proc$lzycompute$1(ProcessOps.scala:128)
    os.proc.proc$1(ProcessOps.scala:122)
    os.proc.spawn(ProcessOps.scala:135)
    mill.modules.Jvm$.spawnSubprocess(Jvm.scala:140)
    mill.modules.Jvm$.runSubprocess(Jvm.scala:82)
    mill.modules.Jvm$.runSubprocess(Jvm.scala:66)
    mill.scalalib.TestModule.$anonfun$testTask$1(JavaModule.scala:659)
    mill.define.ApplyerGenerated.$anonfun$zipMap$10(ApplicativeGenerated.scala:23)
    mill.define.Task$MappedDest.evaluate(Task.scala:392)