remove alpine dockerfile

Signed-off-by: Rui Yang <[email protected]>

Author: Rui Yang

dockerfiles/ubuntu/Dockerfile Dockerfile

@@ -226,11 +226,11 @@ environment is consistent across any `docker` enabled platform. When the docker
 image builds, the test are run inside the docker container, on failure they
 will stop the build.
 
-Run the tests with the following commands for both `alpine` and `ubuntu` images:
+Run the tests with the following command:
 
 ```sh
-docker build -t s3-resource --target tests -f dockerfiles/alpine/Dockerfile .
-docker build -t s3-resource --target tests -f dockerfiles/ubuntu/Dockerfile .
+docker build -t s3-resource --target tests --build-arg base_image=paketobuildpacks/run-jammy-base:latest .
+ .
 ```
 
 #### Integration tests
@@ -242,15 +242,7 @@ integration will run.
 Run the tests with the following command:
 
 ```sh
-docker build . -t s3-resource --target tests -f dockerfiles/alpine/Dockerfile \
-  --build-arg S3_TESTING_ACCESS_KEY_ID="access-key" \
-  --build-arg S3_TESTING_SECRET_ACCESS_KEY="some-secret" \
-  --build-arg S3_TESTING_BUCKET="bucket-non-versioned" \
-  --build-arg S3_VERSIONED_TESTING_BUCKET="bucket-versioned" \
-  --build-arg S3_TESTING_REGION="us-east-1" \
-  --build-arg S3_ENDPOINT="https://s3.amazonaws.com"
-
-docker build . -t s3-resource --target tests -f dockerfiles/ubuntu/Dockerfile \
+docker build . -t s3-resource --target tests \
   --build-arg S3_TESTING_ACCESS_KEY_ID="access-key" \
   --build-arg S3_TESTING_SECRET_ACCESS_KEY="some-secret" \
   --build-arg S3_TESTING_BUCKET="bucket-non-versioned" \