Merge pull request #74 from importhuman/update-default-version

Add workflow to update default pack version

.github/workflows/update-version.yml

@@ -0,0 +1,26 @@
+name: update-pack-version
+
+on:
+  repository_dispatch:
+    types:
+      - pack-release
+
+jobs:
+  update-version:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Update pack version of buildpacks/github-actions/setup-pack/action.yml on new pack release
+        uses: actions/checkout@v2
+        run: |
+            NEW_VERSION = $(curl -s -H "Accept: application/vnd.github.v3+json" https://api.github.com/repos/buildpacks/pack/releases/latest | jq .tag_name -r | cut -c 2-)
+            sed -i -z "s/default:     '[0-9]\{1,\}.[0-9]\{1,\}.[0-9]\{1,\}'/default:     '$NEW_VERSION'/2" setup-pack/action.yml
+      - name: Create pull request
+        uses: peter-evans/create-pull-request@v3
+        with:
+          token: ${{ secrets.DISTRIBUTION_GITHUB_TOKEN }}
+          commit-message: Update version to latest release of buildpacks/pack
+          title: Update default version of setup-pack/action.yml
+          body: Updates default version of setup-pack/action.yml to reflect release changes in buildpacks/pack
+          branch: update-version
+          base: main
+          signoff: true