fix(s3): use ConfigProvider for FLOCI_HOSTNAME to fix native image crash

[Meemaw]

Summary

S3VirtualHostFilter used @ConfigProperty constructor injection for floci.hostname, which gets baked into the GraalVM native binary at build time. Setting FLOCI_HOSTNAME at runtime via Docker env var caused:

IllegalStateException: the runtime value of 'floci.hostname' is [localhost]
but the value [null] was injected into S3VirtualHostFilter()

This PR replaces the @Inject/@ConfigProperty constructor with a no-arg constructor that reads config via ConfigProvider.getConfig() at runtime. @PreMatching JAX-RS filters are instantiated before CDI beans are fully initialized, so neither @ConfigProperty nor @ConfigMapping (EmulatorConfig) injection works — both cause SRCFG00027 at startup.

Additionally, bucket extraction is now hostname-aware: the first label is only treated as a bucket name when the remainder matches the configured base hostname (or a well-known AWS S3 domain like *.s3.amazonaws.com). Previously, any subdomain was treated as a bucket, which caused false positives in multi-label hostname environments (e.g. floci.svc.cluster.local would incorrectly extract floci as a bucket name).

Updates since last revision

• Replaced @Inject EmulatorConfig approach with programmatic ConfigProvider.getConfig().getOptionalValue() — the EmulatorConfig @ConfigMapping bean also fails to inject in @PreMatching filters
• Added inline comment explaining the CDI timing constraint

Type of change

• Bug fix (fix:)

AWS Compatibility

Incorrect behavior: FLOCI_HOSTNAME env var crashes the native image on startup. Without it, virtual-host bucket extraction has no hostname awareness, causing false positives in Docker Compose / Kubernetes setups.

Important for review

• effectiveBaseUrl() logic duplication: The hostname-into-URL replacement regex from EmulatorConfig.effectiveBaseUrl() is duplicated in the constructor (~3 lines). This is unavoidable since CDI injection is not available in @PreMatching filters; worth verifying the regex stays in sync.
• Breaking behavioral change in extractBucket: The old heuristic (first-label-is-always-a-bucket) is replaced with hostname-matching. Users with arbitrary custom hostnames (e.g. my-bucket.myhost:4566) must now set FLOCI_HOSTNAME=myhost for virtual-hosted-style to work. Path-style requests are unaffected.
• isAwsS3Domain fallback: Only covers s3.amazonaws.com and s3.<region>.amazonaws.com. Other S3 endpoint patterns (e.g. s3-external-1.amazonaws.com) are not matched.
• No integration test for FLOCI_HOSTNAME: The unit tests cover extractBucket with various baseHostname values, but there's no Quarkus integration test that sets FLOCI_HOSTNAME as a config override and verifies end-to-end virtual-host routing.

Checklist

• ./mvnw test passes locally
• New or updated integration test added
• Commit messages follow Conventional Commits

Link to Devin session: https://app.devin.ai/sessions/06b7e28f3e664783b17ed18060e5c267
Requested by: @Meemaw

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[devin-ai-integration]

Original prompt from Matej

switch from localstsvk to floci. Minimal vode changes, just change the container image

[devin-ai-integration]

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