Add user-facing doc "SLSA Provenance"

Fixes #786 The doc includes instruction on how to configure a pipeline/task so that Tekton Chains can generate provenance properly. Signed-off-by: Chuang Wang <chuangw@google.com>
tektoncd · Oct 5, 2023 · f4c9ff6 · f4c9ff6
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diff --git a/docs/config.md b/docs/config.md
@@ -10,37 +10,8 @@ weight: 20
 `Chains` works by observing `TaskRun` and `PipelineRun` executions, capturing relevant information, and storing it in a cryptographically-signed format.
 
 `TaskRuns` and `PipelineRuns` can indicate inputs and outputs which are then captured and surfaced in the `Chains` payload formats, where relevant.
-`Chains` uses the standard mechanisms (`Results` and `PipelineResources`) where possible, and provides a few other mechanisms to *hint* at the correct inputs and outputs. These are outlined below:
+`Chains` uses the `Results` to *hint* at the correct inputs and outputs. Check out [how-to-chain-with-pipeline.md](how-to-chain-with-pipeline.md) for more details.
 
-## Chains Type Hinting
-
-When outputting an OCI image without using a `PipelineResource`, `Chains` will look for the following Results:
-
-* `*IMAGE_URL` - The URL to the built OCI image
-* `*IMAGE_DIGEST` - The Digest of the built OCI image
-
-where `*` indicates any expression.
-For example, if **both** `MYIMAGE_IMAGE_URL` AND `MYIMAGE_IMAGE_DIGEST` are correctly formatted to point to an OCI image, then `chains` will pick up on it and try to sign the image.
-
-Multiple images can be specified by using different prefixes in place of `*`.
-
-Multiple images can also be specified by using the `IMAGES` Result.
-The value of the `IMAGES` result is a list of images, each qualified by digest.
-The list of images can be separated by commas or by newlines.
-
-```shell
-- name: IMAGES
-  value: img1@sha256:digest1, img2@sha256:digest2
-```
-
-When processing a `TaskRun`, Chains will parse through the list, then sign and attest each image.
-When processing a `PipelineRun`, Chains will only attest each image. Thus, if both `TaskRun` and
-`PipelineRun` produce type hint results, each image will have one signature and two attestations.
-
-For in-toto attestations, see [intoto.md](intoto.md) for description
-of in-toto specific type hinting.
-
-Note that these are provided automatically when using `PipelineResources`.
 
 ## Chains Configuration