docs: Mention pixi exec in GHA docs

docs/advanced/github_actions.md

@@ -235,6 +235,29 @@ If you want to use PowerShell, you need to specify `-Command` as well.
     There are some custom shells provided by GitHub that have slightly different behavior, see [`jobs.<job_id>.steps[*].shell`](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#jobsjob_idstepsshell) in the documentation.
     See the [official documentation](https://docs.github.com/en/actions/using-workflows/workflow-syntax-for-github-actions#custom-shell) and [ADR 0277](https://github.com/actions/runner/blob/main/docs/adrs/0277-run-action-shell-options.md) for more information about how the `shell:` input works in GitHub Actions.
 
+#### One-off shell wrapper using `pixi exec`
+
+With `pixi exec`, you can also run a one-off command inside a temporary pixi environment.
+
+```yaml
+- run: | # (1)!
+    zstd --version
+  shell: pixi exec --spec zstd -- bash -e {0}
+```
+
+1. everything here will be run inside of the temporary pixi environment
+
+```yaml
+- run: | # (1)!
+    import ruamel.yaml
+    # ...
+  shell: pixi exec --spec python=3.11.* --spec ruamel.yaml -- python {0}
+```
+
+1. everything here will be run inside of the temporary pixi environment
+
+See [here](../reference/cli.md#exec) for more information about `pixi exec`.
+
 ### Environment activation
 
 Instead of using a custom shell wrapper, you can also make all pixi-installed binaries available to subsequent steps by "activating" the installed environment in the currently running job.

docs/advanced/updates_github_actions.md

@@ -41,8 +41,8 @@ jobs:
           run-install: false
       - name: Update lockfiles
         run: |
-          pixi global install pixi-diff-to-markdown
-          pixi update --json --no-install | pixi-diff-to-markdown >> diff.md
+          set -o pipefail
+          pixi update --json --no-install | pixi exec pixi-diff-to-markdown >> diff.md
       - name: Create pull request
         uses: peter-evans/create-pull-request@v6
         with:

docs/reference/cli.md

@@ -94,7 +94,7 @@ pixi add --feature featurex numpy
 ```
 
 !!! tip
-    If you want to use a non default pinning strategy, you can set it using [pixi's configuration](reference/pixi_configuration#pinning-strategy).
+    If you want to use a non default pinning strategy, you can set it using [pixi's configuration](./pixi_configuration.md#pinning-strategy).
     ```
     pixi config set pinning-strategy no-pin --global
     ```