Add bazelisk package.

Signed-off-by: Dan Lorenc <dlorenc@chainguard.dev>

bazelisk.yaml

@@ -0,0 +1,48 @@
+package:
+  name: bazelisk
+  version: 1.19.0
+  epoch: 0
+  description: A user-friendly launcher for Bazel.
+  copyright:
+    - license: Apache-2.0
+  dependencies:
+    runtime:
+      - ca-certificates-bundle
+
+environment:
+  contents:
+    packages:
+      - busybox
+      - ca-certificates-bundle
+      - go
+
+pipeline:
+  - uses: git-checkout
+    with:
+      repository: https://github.com/bazelbuild/bazelisk
+      expected-commit: c7c6c19799ff408c48bdce6b7557217ad0050b17
+      tag: v${{package.version}}
+
+  - uses: go/build
+    with:
+      packages: .
+      output: bazelisk
+
+  - uses: strip
+
+subpackages:
+  - name: bazelisk-default
+    pipeline:
+      - runs: |
+          # Configure bazelisk as bazel
+          mkdir -p ${{targets.subpkgdir}}/usr/bin/
+          ln -sf /usr/bin/bazelisk ${{targets.subpkgdir}}/usr/bin/bazel
+    dependencies:
+      runtime:
+        - bazelisk
+
+update:
+  enabled: true
+  github:
+    identifier: bazelbuild/bazelisk
+    strip-prefix: v