better-setup-just v1: static pinned install, no GitHub API probe (Forgejo-runner safe)

README.md

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+# better-setup-just
+
+Own fork of the setup-just recipe for git.madapes.com runners. Installs a **pinned** `just`
+by downloading the release tarball directly — the upstream action resolves versions through
+api.github.com with the runner's `GITHUB_TOKEN`, which on Forgejo is an instance token and
+answers `Bad credentials`.
+
+```yaml
+- uses: https://git.madapes.com/actions/better-setup-just@v1
+  with: { just-version: "1.40.0" }   # pin; defaults to the tested version
+```

action.yml

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+name: better-setup-just
+description: Install a pinned just binary statically from its GitHub release asset — no GitHub
+  API call and no token, so it works on Forgejo/act runners where the runner's GITHUB_TOKEN is
+  an instance token (upstream setup-just probes api.github.com and fails: Bad credentials).
+inputs:
+  just-version:
+    description: Exact just version to install (x.y.z).
+    default: "1.40.0"
+runs:
+  using: composite
+  steps:
+    - shell: bash
+      run: |
+        set -euo pipefail
+        v="${{ inputs.just-version }}"
+        case "$(uname -m)" in
+          x86_64|amd64) arch=x86_64 ;;
+          aarch64|arm64) arch=aarch64 ;;
+          *) echo "better-setup-just: unsupported arch $(uname -m)" >&2; exit 1 ;;
+        esac
+        curl -fsSL "https://github.com/casey/just/releases/download/${v}/just-${v}-${arch}.tar.gz" \
+          | tar -xz -C /usr/local/bin just
+        just --version