docs: Update CHANGELOG for v1.7.0 (#2196)

* docs: Update CHANGELOG for release v1.7.0

---------

Signed-off-by: Asra Ali <asraa@google.com>

CHANGELOG.md

@@ -10,7 +10,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 <!-- toc -->
 
 - [Unreleased](#unreleased)
-  - [X.Y.Z: Go builder](#xyz-go-builder)
+- [1.7.0](#170)
+  - [1.7.0: Go builder](#170-go-builder)
 - [v1.6.0](#v160)
   - [Summary of changes](#summary-of-changes)
     - [Go builder](#go-builder)
@@ -87,7 +88,11 @@ Use the format "X.Y.Z: Go builder" etc. for format headers to avoid header name
 duplication."
 -->
 
-### X.Y.Z: Go builder
+## 1.7.0
+
+This release includes the first beta release of the [Container-based builder](https://github.com/slsa-framework/slsa-github-generator/tree/v1.7.0/internal/builders/docker). The Container-based builder provides a GitHub Actions reusable workflow that can be used to invoke a container image with a user-specified command to generate an artifact and SLSA Build L3 compliant provenance.
+
+### 1.7.0: Go builder
 
 - **Added**: A new
   [go-version-file](https://github.com/slsa-framework/slsa-github-generator/blob/main/internal/builders/go/README.md#workflow-inputs)

README.md

@@ -119,7 +119,7 @@ This repository hosts the following builders:
 2. [Node.js Builder SLSA Level 3](internal/builders/nodejs/README.md).
    **Status**: [Beta since v1.6.0](https://github.com/slsa-framework/slsa-github-generator/milestone/8).
    [Expected GA release Jun 2023](https://github.com/slsa-framework/slsa-github-generator/milestone/17).
-3. _Container-based Builder SLSA Level 3_. **Status**: [WIP, expected release by Jun 2023](https://github.com/slsa-framework/slsa-github-generator/milestone/4). This builder will build arbitrary artifacts by executing a user-supplied container image.
+3. _Container-based Builder SLSA Level 3_. **Status**: [Beta release since v1.7.0](https://github.com/slsa-framework/slsa-github-generator/milestone/4). This builder will build arbitrary artifacts by executing a user-supplied container image.
 4. _Container Builder SLSA Level 3_. **Status**: [WIP](https://github.com/slsa-framework/slsa-github-generator/milestone/5).
    This builder will build your container image and generate provenance. The generated provenance will be compatible with
    [cosign](https://github.com/sigstore/cosign)'s attestation format.

internal/builders/docker/README.md

@@ -15,16 +15,8 @@ from the [generic artifact workflow](../generic/README.md) as it performs the
 build as well as generates the provenance. This workflow uses a distinct build
 type that provides the full details on the build process.
 
-**NOTE**: This workflow is currently pending
-[release](https://github.com/slsa-framework/slsa-github-generator/milestone/4).
-For stable testing, use the following reusable workflow that uses the same
-inputs and outputs documented below.
-
-```yaml
-uses: slsa-framework/slsa-github-generator/.github/workflows/builder_docker-based_slsa3.yml@v1.6.0
-```
-
-This is compatible with the `slsa-verifier` version 2.6.x.
+**NOTE**: This workflow is currently in
+[beta testing](https://github.com/slsa-framework/slsa-github-generator/milestone/4).
 
 ---