Add trigger github workflow task

tasks/trigger-github-workflow/task

@@ -0,0 +1,97 @@
+#!/bin/bash
+set -eu
+
+##
+# Triggers a GitHub Actions workflow via workflow_dispatch, locates the
+# resulting run, and streams its output until completion.
+#
+# Requires these environment variables:
+#   GITHUB_TOKEN  – PAT or GitHub App token with Actions scope
+#   GITHUB_REPO   – owner/repo (e.g. cloudfoundry/kind-deployment)
+#   WORKFLOW_FILE – workflow filename (e.g. kind-smoke.yaml)
+#   WORKFLOW_REF  – git ref to run against (default: main)
+#   WORKFLOW_INPUTS – JSON object of workflow inputs (default: {})
+##
+
+export GH_TOKEN="${GITHUB_TOKEN}"
+
+TEAM_NAME="${BUILD_TEAM_NAME:-unknown-team}"
+PIPELINE_NAME="${BUILD_PIPELINE_NAME:-unknown-pipeline}"
+JOB_NAME="${BUILD_JOB_NAME:-unknown-job}"
+BUILD_NAME="${BUILD_NAME:-unknown-build}"
+TRIGGER_SOURCE="${TEAM_NAME}/${PIPELINE_NAME}/${JOB_NAME}/${BUILD_NAME}"
+TRIGGER_ID=$(printf 'cfd-%s-%s-%s-%s-%s' \
+  "${TEAM_NAME}" "${PIPELINE_NAME}" "${JOB_NAME}" "${BUILD_NAME}" "$(date -u +%s)" \
+  | tr '/:@ ' '-' \
+  | tr -cd '[:alnum:]._-')
+
+if [ -z "${TRIGGER_ID}" ]; then
+  TRIGGER_ID="cfd-$(date -u +%s)"
+fi
+
+DISPATCH_TS=$(date -u +"%Y-%m-%dT%H:%M:%SZ")
+ACTOR_LOGIN=$(gh api user --jq '.login')
+
+INPUTS_JSON=$(printf '%s' "${WORKFLOW_INPUTS}" \
+  | jq -ce 'if type == "object" then . else error("WORKFLOW_INPUTS must be a JSON object") end')
+
+# ── snapshot the latest existing run ID so we can find our new one ──
+BEFORE_ID=$(gh run list \
+  --repo "${GITHUB_REPO}" \
+  --workflow "${WORKFLOW_FILE}" \
+  --event workflow_dispatch \
+  --limit 1 \
+  --json databaseId \
+  --jq '.[0].databaseId // 0' 2>/dev/null || echo "0")
+
+# ── dispatch the workflow ───────────────────────────────────────────
+echo "Dispatching ${WORKFLOW_FILE} on ${GITHUB_REPO}@${WORKFLOW_REF}..."
+echo "Trigger ID: ${TRIGGER_ID}"
+echo "Trigger source: ${TRIGGER_SOURCE}"
+echo "Workflow actor: ${ACTOR_LOGIN}"
+echo "${INPUTS_JSON}" \
+  | jq --arg ref "${WORKFLOW_REF}" '{ref: $ref, inputs: .}' \
+  | gh api --method POST \
+    "/repos/${GITHUB_REPO}/actions/workflows/${WORKFLOW_FILE}/dispatches" \
+    --input -
+
+# ── locate the newly created run ────────────────────────────────────
+echo "Locating workflow run (previous latest ID: ${BEFORE_ID})..."
+RUN_ID=""
+attempt=0
+while [ "${attempt}" -lt 60 ]; do
+  RUN_ID=$(gh api \
+    "/repos/${GITHUB_REPO}/actions/workflows/${WORKFLOW_FILE}/runs?event=workflow_dispatch&branch=${WORKFLOW_REF}&per_page=20" \
+    2>/dev/null \
+    | jq -r \
+      --argjson before_id "${BEFORE_ID}" \
+      --arg dispatch_ts "${DISPATCH_TS}" \
+      --arg actor_login "${ACTOR_LOGIN}" \
+      '.workflow_runs
+       | map(
+           select(
+             (.id > $before_id)
+             and (.created_at >= $dispatch_ts)
+             and (.actor.login == $actor_login)
+           )
+         )
+       | .[0].id // empty' || true)
+
+  if [ -n "${RUN_ID}" ]; then
+    break
+  fi
+  attempt=$((attempt + 1))
+  sleep 10
+done
+
+if [ -z "${RUN_ID}" ]; then
+  echo "ERROR: Dispatched run not found after 10 minutes."
+  echo "Expected trigger_id=${TRIGGER_ID}"
+  echo "Expected actor=${ACTOR_LOGIN}"
+  echo "Workflow=${WORKFLOW_FILE} ref=${WORKFLOW_REF}"
+  exit 1
+fi
+
+# ── watch the run until completion ──────────────────────────────────
+echo "Watching: https://github.com/${GITHUB_REPO}/actions/runs/${RUN_ID}"
+gh run watch "${RUN_ID}" --repo "${GITHUB_REPO}" --exit-status

tasks/trigger-github-workflow/task.yml

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+---
+platform: linux
+
+image_resource:
+  type: registry-image
+  source:
+    repository: cloudfoundry/cf-deployment-concourse-tasks
+
+inputs:
+- name: runtime-ci
+
+params:
+  GITHUB_TOKEN:
+  GITHUB_REPO:
+  WORKFLOW_FILE:
+  WORKFLOW_REF: main
+  WORKFLOW_INPUTS: "{}"
+
+run:
+  path: runtime-ci/tasks/trigger-github-workflow/task