Update CLI docs

Author: Hofer-Julian

docs/reference/cli/pixi/upload/prefix.md

@@ -29,6 +29,8 @@ pixi upload prefix [OPTIONS] --channel <CHANNEL>
 :  Upload an attestation file alongside the package. Note: if you add an attestation, you can _only_ upload a single package. Mutually exclusive with --generate-attestation
 - <a id="arg---generate-attestation" href="#arg---generate-attestation">`--generate-attestation`</a>
 :  Automatically generate attestation using cosign in CI. Mutually exclusive with --attestation
+- <a id="arg---store-github-attestation" href="#arg---store-github-attestation">`--store-github-attestation`</a>
+:  Also store the generated attestation to GitHub's attestation API. Requires `GITHUB_TOKEN` environment variable and only works in GitHub Actions. The attestation will be associated with the current repository
 - <a id="arg---skip-existing" href="#arg---skip-existing">`--skip-existing (-s)`</a>
 :  Skip upload if package already exists
 - <a id="arg---force" href="#arg---force">`--force`</a>

pixi.toml

@@ -22,7 +22,6 @@ python = ">=3.13.5,<3.15"
 
 [tasks]
 bump = "tbump --only-patch $RELEASE_VERSION"
-generate-cli-docs = "cargo run --locked --manifest-path crates/pixi_docs/Cargo.toml"
 insta = "cargo insta"
 install = { cmd = "cargo install --path crates/pixi --locked", description = "Install pixi itself locally using cargo" }
 install-as = { cmd = "python scripts/install.py", depends-on = [
@@ -206,6 +205,7 @@ env.CARGO_TARGET_DIR = "target/pixi"
 [feature.build.tasks]
 build-debug = "cargo build"
 build-release = "cargo build --release"
+generate-cli-docs = "cargo run --locked --manifest-path crates/pixi_docs/Cargo.toml"
 
 [feature.docs.dependencies]
 cairosvg = ">=2.8.2,<3"