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WIP: Make
QuarkusBuild
not pollute Gradle's build cache
Currently the `QuarkusBuild` task implementation adds even large build artifacts and unmodified dependency jars to Gradle's build cache. This pollutes the Gradle build cache quite a lot and therefore lets archived build caches become unnecessary huge. This change updates the build logic to fix this behavior by not adding dependencies and large build artifacts, like uber-jar and native binary, to the Gradle build cache. The `QuarkusBuild` task has been split into three tasks: 1. a new `QuarkusBuildDependencies` task that only collects the contents for `build/quarkus-app/lib` 2. a new `QuarkusBuildApp` task that to collect everything else from a Quarkus build (everything except the `build/quarkus-app/lib`) 3. the `QuarkusBuild` task now combines the outputs of the above two tasks `QuarkusBuildDependencies` (named 'quarkusDependenciesBuild`) is not cacheable, because it only collects dependencies, which come either from a repository (and are already available locally elsewhere) or are built by other Gradle tasks. This task is only executed if the configured Quarkus package type requires the "quarkus-app" directory (`fast-jar` + `native`). It's "build working directory" is `build/quarkus-build/dep`. `QuarkusBuildApp` (named `quarkusAppBuild`) collects the contents of the "quarkus-app" directory _excluding_ the `lib/` directory are cacheable, which is the default for CI environments. Non-CI environments still cache all outputs, even uber-jars and native binaries to retain the existing behavior for developers and keep build turn-around times low. CI environments can opt-in to add even huge artifacts to Gradle's build cache by explicitly setting the `cacheUberAndNativeRunners` property in the Quarkus extension to `true`. It's "build working directory" is `build/quarkus-build/app`. Since `QuarkusBuild` only combines the outputs of the above two tasks, the same "CI vs local" caching behavior as for the `QuarkusBuildApp` task applies. To make "up to date" checks (kind of) more reliable, all outputs are removed first. This means, that for example an existing uber-jar in `build/` will disappear, when the build's package type is "fast-jar". This behavior can be disabled by setting the `cleanupBuildOutput` property on the Quarkus extension to `false`. Both `QuarkusBuildDependencies` and `QuarkusBuildApp` can trigger an actual Quarkus application build. That Quarkus app build will only be triggered when needed and only once per Gradle build. The task names `quarkusDependenciesBuild` and `quarkusAppBuild` are intentionally "that way around". Letting the names of these tasks begin with `quarkusBuild...` could confuse users, who use abbreviated task names on the command line (for example `./gradlew qB` is automagically expanded to `./gradlew quarkusBuild`, which would become ambiguous with `quarkusBuildDependencies` and `quarkusBuildApp`). Unless the `cacheLargeArtifacts` property on the `quarkus` extension is set to `true`, the output of/for the package type `fast-jar` minus the dependency jars is cached by Gradle's build cache (similar for `legacy-jar`). Basically everything is cacheable to allow fast(er) local development turn-around cycles. Relates to: quarkusio#30852
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