ci: add wrapper script for running ci locally

Linux only for now

ci/env.sh

@@ -74,10 +74,13 @@ else
   export CI_BUILD_ID=
   export CI_COMMIT=
   export CI_JOB_ID=
-  export CI_OS_NAME=
   export CI_PULL_REQUEST=
   export CI_REPO_SLUG=
   export CI_TAG=
+  # Don't override ci/run-local.sh
+  if [[ -z $CL_LOCAL_RUN ]]; then
+    export CI_OS_NAME=
+  fi
 fi
 
 cat <<EOF

ci/run-local.sh

@@ -0,0 +1,54 @@
+#!/usr/bin/env bash
+
+cd "$(dirname "$0")/.."
+
+export CI_LOCAL_RUN=true
+
+set -e
+
+case $(uname -o) in
+  */Linux)
+    export CI_OS_NAME=linux
+    ;;
+  *)
+    echo "local CI runs are only supported on Linux" 1>&2
+    exit 1
+    ;;
+esac
+
+steps=()
+steps+=(test-sanity)
+steps+=(shellcheck)
+steps+=(test-checks)
+steps+=(test-coverage)
+steps+=(test-stable)
+steps+=(test-stable-perf)
+steps+=(test-downstream-builds)
+steps+=(test-bench)
+steps+=(test-local-cluster)
+
+step_index=0
+if [[ -n "$1" ]]; then
+  start_step="$1"
+  while [[ $step_index -lt ${#steps[@]} ]]; do
+    step="${steps[$step_index]}"
+    if [[ "$step" = "$start_step" ]]; then
+      break
+    fi
+    step_index=$((step_index + 1))
+  done
+  if [[ $step_index -eq ${#steps[@]} ]]; then
+    echo "unexpected start step: \"$start_step\"" 1>&2
+    exit 1
+  else
+    echo "** starting at step: \"$start_step\" **"
+    echo
+  fi
+fi
+
+while [[ $step_index -lt ${#steps[@]} ]]; do
+  step="${steps[$step_index]}"
+  cmd="ci/${step}.sh"
+  $cmd
+  step_index=$((step_index + 1))
+done