ci: add script to check modules on registry.coder.com

.github/workflows/check.yaml

@@ -0,0 +1,18 @@
+name: Check modules on registry.coder.com
+
+on:
+  schedule:
+    - cron: "23 * * * *" # Runs at 23 minutes past the hour.
+  workflow_dispatch: # Allows manual triggering of the workflow if needed
+
+jobs:
+  run-script:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Run check.sh
+        run: |
+          ./check.sh

check.sh

@@ -0,0 +1,36 @@
+#!/usr/bin/env bash
+set -o pipefail
+REGISTRY_BASE_URL="${REGISTRY_BASE_URL:-https://registry.coder.com}"
+set -u
+
+if [[ -n "${VERBOSE:-}" ]]; then
+    set -x
+fi
+
+status=0
+declare -a modules=()
+declare -a failures=()
+for path in $(find . -not -path '*/.*' -type f -name main.tf -maxdepth 2 | cut -d '/' -f 2 | sort -u); do
+    modules+=("${path}")
+done
+echo "Checking modules: ${modules[*]}"
+for module in "${modules[@]}"; do
+    # Trim leading/trailing whitespace from module name
+    module=$(echo "${module}" | xargs)
+    url="${REGISTRY_BASE_URL}/modules/${module}"
+    printf "=== Check module %s at %s\n" "${module}" "${url}"
+    status_code=$(curl --output /dev/null --head --silent --fail --location "${url}" --retry 3 --write-out "%{http_code}")
+    # shellcheck disable=SC2181
+    if (( status_code != 200 )); then
+        printf "==> FAIL(%s)\n" "${status_code}"
+        status=1
+        failures+=("${module}")
+    else
+        printf "==> OK(%s)\n" "${status_code}"
+    fi
+done
+
+if (( status != 0 )); then
+    echo "The following modules appear to have issues: ${failures[*]}"
+fi
+exit "${status}"