ci: update pact ffi on release workflow

.github/workflows/update-ffi.yml

@@ -0,0 +1,21 @@
+name: Update Pact FFI Library
+
+on:
+  repository_dispatch:
+    types:
+      - pact-ffi-released
+
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+
+    - run: |
+        git config --global user.email "${GITHUB_ACTOR}@users.noreply.github.com"
+        git config --global user.name "${GITHUB_ACTOR}"
+        git config pull.ff only
+
+    - run: script/create-pr-to-update-pact-ffi.sh ${{ github.event.client_payload.version }}
+      env:
+        GITHUB_TOKEN: '${{ secrets.GITHUB_TOKEN }}'

script/create-pr-to-update-pact-ffi.sh

@@ -0,0 +1,27 @@
+#!/bin/sh
+
+set -e
+
+: "${1?Please supply the pact-ffi version to upgrade to}"
+
+FFI_VERSION=$1
+TYPE=${2:-fix}
+DASHERISED_VERSION=$(echo "${FFI_VERSION}" | sed 's/\./\-/g')
+BRANCH_NAME="chore/upgrade-to-pact-ffi-${DASHERISED_VERSION}"
+
+git checkout master
+git checkout src/ffi/index.ts
+git pull origin master
+
+git checkout -b ${BRANCH_NAME}
+
+cat src/ffi/index.ts | sed "s/export const PACT_FFI_VERSION.*/export const PACT_FFI_VERSION = '${FFI_VERSION}';/" > tmp-install
+mv tmp-install src/ffi/index.ts
+
+git add src/ffi/index.ts
+git commit -m "${TYPE}: update pact-ffi to ${FFI_VERSION}"
+git push --set-upstream origin ${BRANCH_NAME}
+
+gh pr create --title "${TYPE}: update pact-ffi to ${FFI_VERSION}" --fill
+
+git checkout master

script/dispatch-ffi-released.sh

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+#!/bin/sh
+
+# Script to trigger an update of the pact ffi from pact-foundation/pact-reference to listening repos
+# Requires a Github API token with repo scope stored in the
+# environment variable GITHUB_ACCESS_TOKEN_FOR_PF_RELEASES
+
+: "${GITHUB_ACCESS_TOKEN_FOR_PF_RELEASES:?Please set environment variable GITHUB_ACCESS_TOKEN_FOR_PF_RELEASES}"
+
+if [ -n "$1" ]; then
+  name="\"${1}\""
+else
+  echo "name not provided as first param"
+  exit 1
+fi
+
+if [ -n "$2" ]; then
+  version="\"${2}\""
+else
+  echo "name not provided as second param"
+  exit 1
+fi
+
+repository_slug=$(git remote get-url origin | cut -d':' -f2 | sed 's/\.git//')
+
+output=$(curl -v https://api.github.com/repos/${repository_slug}/dispatches \
+      -H 'Accept: application/vnd.github.everest-preview+json' \
+      -H "Authorization: Bearer $GITHUB_ACCESS_TOKEN_FOR_PF_RELEASES" \
+      -d "{\"event_type\": \"pact-ffi-released\", \"client_payload\": {\"name\": ${name}, \"version\" : ${version}}}" 2>&1)
+
+if  ! echo "${output}" | grep "HTTP\/.* 204" > /dev/null; then
+  echo "$output" | sed  "s/${GITHUB_ACCESS_TOKEN_FOR_PF_RELEASES}/********/g"
+  echo "Failed to trigger update"
+  exit 1
+else
+  echo "Update workflow triggered"
+fi
+
+echo "See https://github.com/${repository_slug}/actions?query=workflow%3A%22Update+Pact+FFI+Library%22"