Fix arch detection inside aarch64 containers

This change also starts testing on arm systems.

Author: bigfootjon

.github/workflows/test.yml

@@ -10,13 +10,16 @@ on:
 
 jobs:
   test-devcontainer-feature-autogenerated:
-    runs-on: ubuntu-latest
     strategy:
       matrix:
         baseImage:
           - debian:latest
           - ubuntu:latest
           - mcr.microsoft.com/devcontainers/base:ubuntu
+        runsOn:
+          - ubuntu-24.04-arm
+          - ubuntu-latest
+    runs-on: ${{ matrix.runsOn }}
     steps:
       - uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2
       - name: Install the latest devcontainer CLI

devcontainer-features/src/dotslash/install.sh

@@ -26,7 +26,11 @@ ensure_dependencies() {
 download() {
   local version="$1"
   local url
-  url="https://github.com/facebook/dotslash/releases/download/${version}/dotslash-linux-musl.$(uname -m).${version}.tar.gz"
+  local arch=$(uname -m)
+  if [ "${arch}" = "aarch64" ]; then
+    arch="arm64"
+  fi
+  url="https://github.com/facebook/dotslash/releases/download/${version}/dotslash-linux-musl.${arch}.${version}.tar.gz"
 
   # First, verify the release exists!
   echo "Fetching version ${version} from ${url}..."
@@ -43,8 +47,8 @@ download() {
 }
 
 list_releases() {
-  local url="https://api.github.com/repos/facebook/dotslash/releases"
-  curl -s "${url}" | jq -c '.[] | select(.draft == false and .prerelease == false) | .tag_name'
+  local releases_file="$1"
+  jq -c '.[] | select(.draft == false and .prerelease == false) | .tag_name' "${releases_file}"
 }
 
 echo "Activating feature 'dotslash' with version ${VERSION}"
@@ -58,7 +62,10 @@ ensure_dependencies
 
 if [ "${VERSION}" = "latest" ]; then
   echo "Determining latest release since 'latest' version specified..."
-  VERSION=$(list_releases | head -n 1)
+  releases_file=$(mktemp -t releases.jsonXXX)
+  curl -s "https://api.github.com/repos/facebook/dotslash/releases" -o "${releases_file}"
+  cat "${releases_file}"
+  VERSION=$(list_releases "${releases_file}" | head -n 1)
 fi
 
 # Remove any double quotes that might be in the version string.