docs: replace references to the master branch with v0.13

Signed-off-by: Akihiro Suda <akihiro.suda.cz@hco.ntt.co.jp>
(cherry picked from commit 92ef8b0)

README.md

@@ -286,7 +286,7 @@ Keys supported by image output:
 * `name-canonical=true`: add additional canonical name `name@<digest>`
 * `compression=<uncompressed|gzip|estargz|zstd>`: choose compression type for layers newly created and cached, gzip is default value. estargz should be used with `oci-mediatypes=true`.
 * `compression-level=<value>`: compression level for gzip, estargz (0-9) and zstd (0-22)
-* `rewrite-timestamp=true` (Present in the `master` branch <!-- TODO: v0.13-->): rewrite the file timestamps to the `SOURCE_DATE_EPOCH` value.
+* `rewrite-timestamp=true`: rewrite the file timestamps to the `SOURCE_DATE_EPOCH` value.
    See [`docs/build-repro.md`](docs/build-repro.md) for how to specify the `SOURCE_DATE_EPOCH` value.
 * `force-compression=true`: forcefully apply `compression` option to all layers (including already existing layers)
 * `store=true`: store the result images to the worker's (e.g. containerd) image store as well as ensures that the image has all blobs in the content store (default `true`). Ignored if the worker doesn't have image store (e.g. OCI worker).

docs/build-repro.md

@@ -46,11 +46,7 @@ Minimal support is also available on older BuildKit when using Dockerfile 1.5 fr
 ```console
 buildctl build --frontend dockerfile.v0 --opt build-arg:SOURCE_DATE_EPOCH=$(git log -1 --pretty=%ct) ...
 ```
-
-The `buildctl` CLI (<= 0.12) does not automatically propagate the `$SOURCE_DATE_EPOCH` environment value from the client host to the `SOURCE_DATE_EPOCH` build arg.
-<!-- TODO: s/master/v0.13/ -->
-In the `master` branch of BuildKit, the `buildctl` CLI is updated to automatically capture the environment value.
-Docker Buildx (>= 0.10) automatically captures the environment value too.
+The `buildctl` CLI (>= v0.13) and Docker Buildx (>= 0.10) automatically propagate the `$SOURCE_DATE_EPOCH` environment value from the client host to the `SOURCE_DATE_EPOCH` build arg.
 
 The build arg value is used for:
 - the `created` timestamp in the [OCI Image Config](https://github.com/opencontainers/image-spec/blob/main/config.md#properties)
@@ -64,8 +60,7 @@ To apply the build arg value to the timestamps of the files inside the image, sp
 --output type=image,name=docker.io/username/image,push=true,rewrite-timestamp=true
 ```
 
-<!-- TODO: s/master/v0.13/ -->
-The `rewrite-timestamp` option is only available in the `master` branch of BuildKit.
+The `rewrite-timestamp` option is available since BuildKit v0.13.
 See [v0.12 documentation](https://github.com/moby/buildkit/blob/v0.12/docs/build-repro.md#caveats) for dealing with timestamps
 in BuildKit v0.12 and v0.11.
 

frontend/dockerfile/docs/reference.md

@@ -1575,8 +1575,7 @@ conditions for cache reuse.
 
 > **Note**
 >
-> Available in [`docker/dockerfile-upstream:master-labs`](#syntax).
-> Will be included in `docker/dockerfile:1.7-labs`.
+> Not yet available in stable syntax, use [`docker/dockerfile:1.7-labs`](#syntax) version.
 
 ```dockerfile
 COPY [--parents[=<boolean>]] <src> ... <dest>
@@ -1585,7 +1584,7 @@ COPY [--parents[=<boolean>]] <src> ... <dest>
 The `--parents` flag preserves parent directories for `src` entries. This flag defaults to `false`.
 
 ```dockerfile
-# syntax=docker/dockerfile-upstream:master-labs
+# syntax=docker/dockerfile:1.7-labs
 FROM scratch
 
 COPY ./x/a.txt ./y/a.txt /no_parents/
@@ -1605,7 +1604,7 @@ directories after it will be preserved. This may be especially useful copies bet
 with `--from` where the source paths need to be absolute.
 
 ```dockerfile
-# syntax=docker/dockerfile-upstream:master-labs
+# syntax=docker/dockerfile:1.7-labs
 FROM scratch
 
 COPY --parents ./x/./y/*.txt /parents/
@@ -1634,8 +1633,7 @@ with the `--parents` flag, the Buildkit is capable of packing multiple
 
 > **Note**
 >
-> Available in [`docker/dockerfile-upstream:master-labs`](#syntax).
-> Will be included in `docker/dockerfile:1.7-labs`.
+> Not yet available in stable syntax, use [`docker/dockerfile:1.7-labs`](#syntax) version.
 
 ```dockerfile
 COPY [--exclude=<path> ...] <src> ... <dest>