Add Dispatch to build reference

.github/ISSUE_TEMPLATE.md

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+<!--
+!!! For Security Vulnerabilities, please go to https://spring.io/security-policy !!!
+-->
+**Affects:** \<Spring Framework version>
+
+---
+<!--
+Thanks for taking the time to create an issue. Please read the following:
+
+- Questions should be asked on Stack Overflow.
+- For bugs, specify affected versions and explain what you are trying to do.
+- For enhancements, provide context and describe the problem.
+
+Issue or Pull Request? Create only one, not both. GitHub treats them as the same.
+If unsure, start with an issue, and if you submit a pull request later, the
+issue will be closed as superseded.
+-->

.github/actions/dispatch.sh

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+REPOSITORY_REF="$1"
+TOKEN="$2"
+
+curl -H "Accept: application/vnd.github.everest-preview+json" -H "Authorization: token ${TOKEN}" --request POST  --data '{"event_type": "request-build"}' https://api.github.com/repos/${REPOSITORY_REF}/dispatches
+echo "Requested Build for $REPOSITORY_REF"

.github/workflows/build-reference.yml

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+name: reference
+
+on:
+  push:
+    branches-ignore:
+      - 'gh-pages'
+
+env:
+  GH_TOKEN_DISPATCH: ${{ secrets.GH_TOKEN_DISPATCH }}
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout Source
+        uses: actions/checkout@v2
+      - name: Dispatch Build Request
+        run: ${GITHUB_WORKSPACE}/.github/actions/dispatch.sh 'rwinch/spring-reference' "$GH_TOKEN_DISPATCH"

.github/workflows/gradle-wrapper-validation.yml

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+name: "Validate Gradle Wrapper"
+on: [push, pull_request]
+
+jobs:
+  validation:
+    name: "Validation"
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v2
+      - uses: gradle/wrapper-validation-action@v1