fix(ci): build the compliance adapter with the repo Gradle wrapper

[cat-ph]

Problem

The SDK compliance job fails on every branch since #702 bumped the Gradle wrapper to 9.7.0. The adapter's Dockerfile pins its own Gradle (FROM gradle:9.6.1-jdk17) and runs plain gradle, but the lockfiles are generated by the wrapper - and dependency locking pins the embedded Kotlin build-tools strictly per Gradle release (9.7.0 locks 2.4.0, the container's 9.6.1 requests 2.3.21). Configuration of the gradle-plugin project fails before any test runs.

It slipped through because the compliance workflow's path filter (posthog/**, sdk_compliance_adapter/**) never fires on wrapper or lockfile changes, so #702 merged without ever running the job.

Changes

Build the adapter with the repo's own ./gradlew on a plain JDK image instead of an image-pinned Gradle. The container now always uses exactly the wrapper the lockfiles were generated with, so future wrapper bumps cannot skew it again.

Tests

Local docker build -f sdk_compliance_adapter/Dockerfile . of the exact CI invocation completes successfully (previously failed with the lock conflict). The compliance workflow also runs on this PR since it touches sdk_compliance_adapter/**.

[greptile-apps]

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[github-actions]

posthog-android Compliance Report

Date: 2026-08-18 20:48:23 UTC
Duration: 118093ms

✅ All Tests Passed!

46/46 tests passed

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Capture Tests

✅ 29/29 tests passed

View Details

Test	Status	Duration
Format Validation.Event Has Required Fields	✅	294ms
Format Validation.Event Has Uuid	✅	33ms
Format Validation.Event Has Lib Properties	✅	25ms
Format Validation.Distinct Id Is String	✅	26ms
Format Validation.Token Is Present	✅	22ms
Format Validation.Custom Properties Preserved	✅	27ms
Format Validation.Event Has Timestamp	✅	23ms
Retry Behavior.Retries On 503	✅	7020ms
Retry Behavior.Does Not Retry On 400	✅	4023ms
Retry Behavior.Does Not Retry On 401	✅	4024ms
Retry Behavior.Respects Retry After Header	✅	7026ms
Retry Behavior.Implements Backoff	✅	17022ms
Retry Behavior.Retries On 500	✅	7018ms
Retry Behavior.Retries On 502	✅	7018ms
Retry Behavior.Retries On 504	✅	7018ms
Retry Behavior.Max Retries Respected	✅	17034ms
Deduplication.Generates Unique Uuids	✅	36ms
Deduplication.Preserves Uuid On Retry	✅	7014ms
Deduplication.Preserves Uuid And Timestamp On Retry	✅	12022ms
Deduplication.Preserves Uuid And Timestamp On Batch Retry	✅	7019ms
Deduplication.No Duplicate Events In Batch	✅	34ms
Deduplication.Different Events Have Different Uuids	✅	21ms
Compression.Sends Gzip When Enabled	✅	15ms
Batch Format.Uses Proper Batch Structure	✅	15ms
Batch Format.Flush With No Events Sends Nothing	✅	11ms
Batch Format.Multiple Events Batched Together	✅	25ms
Error Handling.Does Not Retry On 403	✅	4021ms
Error Handling.Does Not Retry On 413	✅	4020ms
Error Handling.Retries On 408	✅	5028ms

Feature_Flags Tests

✅ 17/17 tests passed

View Details

Test	Status	Duration
Request Payload.Request With Person Properties Device Id	✅	30ms
Request Payload.Flags Request Uses V2 Query Param	✅	22ms
Request Payload.Flags Request Hits Flags Path Not Decide	✅	20ms
Request Payload.Flags Request Omits Authorization Header	✅	33ms
Request Payload.Token In Flags Body Matches Init	✅	17ms
Request Payload.Groups Round Trip	✅	20ms
Request Payload.Groups Default To Empty Object	✅	18ms
Request Payload.Disable Geoip False Propagates As Geoip Disable False	✅	21ms
Request Payload.Disable Geoip Omitted Defaults To False	✅	20ms
Request Payload.Flag Keys To Evaluate Contains Only Requested Key	✅	17ms
Request Lifecycle.No Flags Request On Init Alone	✅	7ms
Request Lifecycle.No Flags Request On Normal Capture	✅	30ms
Request Lifecycle.Two Flag Calls Produce Two Remote Requests	✅	30ms
Request Lifecycle.Mock Response Value Is Returned To Caller	✅	16ms
Retry Behavior.Retries Flags On 502	✅	319ms
Retry Behavior.Retries Flags On 504	✅	322ms
Side Effect Events.Get Feature Flag Captures Feature Flag Called Event	✅	19ms