+istio.io (#5602)

* new file:   projects/istio.io/package.yml

* wants `gcc` and `ld.gold`

projects/istio.io/package.yml

@@ -0,0 +1,39 @@
+distributable:
+  url: git+https://github.com/istio/istio.git
+  ref: ${{version.tag}}
+
+versions:
+  github: istio/istio
+
+build:
+  dependencies:
+    go.dev: ^1.21
+    linux/aarch64:
+      gnu.org/gcc: '*' # wants `gcc` and `ld.gold`
+  script:
+    - go build $ARGS -ldflags="$LDFLAGS" ./istioctl/cmd/istioctl
+    - ${{prefix}}/bin/istioctl collateral --man
+    - mkdir -p {{prefix}}/share/man/man1
+    - cp ./*.1 {{prefix}}/share/man/man1/
+  env:
+    ARGS:
+      - -trimpath
+      - -o={{prefix}}/bin/istioctl
+    COMMIT_SHA: $(git describe --always --abbrev=8 --dirty)
+    LDFLAGS:
+      - -s
+      - -w
+      - -X istio.io/istio/pkg/version.buildVersion={{version}}
+      - -X istio.io/istio/pkg/version.buildGitRevision=${COMMIT_SHA}
+      - -X istio.io/istio/pkg/version.buildTag={{version.tag}}
+      - -X istio.io/istio/pkg/version.buildHub=docker.io/istio
+    linux:
+      LDFLAGS:
+        - -buildmode=pie
+
+provides:
+  - bin/istioctl
+
+test:
+  - istioctl version --remote=false | grep {{version}}
+  - istioctl completion bash | grep '__istioctl_format_comp_descriptions()'