feat: add new configuration files for Apt, Apk, Java, and Yum

Signed-off-by: d9pouces <github@19pouces.net>

tests/dockerfiles/repos/APKBUILD

@@ -0,0 +1,13 @@
+pkgname=idconfiguratortestpkg
+pkgver=0.0.1
+pkgrel=0
+pkgdesc="Test-only package served by the id-configurator integration tests"
+url="https://example.invalid"
+arch="noarch"
+license="MIT"
+options="!check"
+
+package() {
+	mkdir -p "$pkgdir"/usr/share/doc/"$pkgname"
+	echo test-only-package > "$pkgdir"/usr/share/doc/"$pkgname"/marker
+}