Add Gitea Actions act runner (#666)

Co-authored-by: dementhorr <dementhorr@proton.me>
Co-authored-by: Vince Montalbano <vince.montalbano@gmail.com>

Reviewed-on: https://gitea.com/gitea/helm-chart/pulls/666
Reviewed-by: justusbunsi <justusbunsi@noreply.gitea.com>
Co-authored-by: vjm <vjm@noreply.gitea.com>
Co-committed-by: vjm <vjm@noreply.gitea.com>

scripts/token.sh

@@ -0,0 +1,43 @@
+#!/bin/sh
+
+set -eu
+
+timeout_delay=15
+
+check_token() {
+  set +e
+
+  echo "Checking for existing token..."
+  token="$(kubectl get secret "$SECRET_NAME" -o jsonpath="{.data['token']}" 2> /dev/null)"
+  [ $? -ne 0 ] && return 1
+  [ -z "$token" ] && return 2
+  return 0
+}
+
+create_token() {
+  echo "Waiting for new token to be generated..."
+  begin=$(date +%s)
+  end=$((begin + timeout_delay))
+  while true; do
+    [ -f /data/actions/token ] && return 0
+    [ "$(date +%s)" -gt $end ] && return 1
+    sleep 5
+  done
+}
+
+store_token() {
+  echo "Storing the token in Kubernetes secret..."
+  kubectl patch secret "$SECRET_NAME" -p "{\"data\":{\"token\":\"$(base64 /data/actions/token | tr -d '\n')\"}}"
+}
+
+if check_token; then
+  echo "Key already in place, exiting."
+  exit
+fi
+
+if ! create_token; then
+  echo "Checking for an existing act runner token in secret $SECRET_NAME timed out after $timeout_delay"
+  exit 1
+fi
+
+store_token