actions: create PR for webtop's builds

.github/workflows/development.yml

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+name: Build Development
+on:
+  workflow_dispatch:
+
+jobs:
+  update_create_pr:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Get current stable version
+      id: get_version
+      run: echo "::set-output name=version::$(cat webtop5-build/VERSION)"
+    - name: Get current stable version
+      id: get_date
+      run: |
+        export TZ=Europe/Rome
+        echo "::set-output name=current::$(date)"
+    - name: Set development version
+      run: echo "development-${{ steps.get_date.outputs.current }}" > webtop5-build/VERSION
+    - name: Create/Update pull request
+      uses: peter-evans/create-pull-request@v3
+      with:
+        branch: ${{ steps.get_version.outputs.version }}-next
+        title: Update to upstream release ${{ steps.get_version.outputs.version }}-next
+        body: ''
+        commit-message: Update development war ${{ steps.get_date.outputs.current }}
+        draft: true
+        token: ${{ secrets.webtop_pr }}

.github/workflows/release.yml

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+name: Build Release
+on:
+  workflow_dispatch:
+    inputs:
+      version:
+        description: 'WebTop Version'
+        required: true
+
+jobs:
+  update_create_pr:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Get current stable version
+      id: get_version
+      run: echo "::set-output name=version::$(cat webtop5-build/VERSION)"
+    - name: Set new version
+      run: echo "wt-${{ github.event.inputs.version }}" > webtop5-build/VERSION
+    - name: Create/Update pull request
+      uses: peter-evans/create-pull-request@v3
+      with:
+        branch: ${{ steps.get_version.outputs.version }}-next
+        title: Update to upstream release wt-${{ github.event.inputs.version }}
+        body: ''
+        commit-message: Update to upstream release wt-${{ github.event.inputs.version }}
+        draft: false
+        token: ${{ secrets.webtop_pr }}

.github/workflows/staging.yml

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+name: Build Staging
+on:
+  workflow_dispatch:
+    inputs:
+      war:
+        description: 'WAR number'
+        required: true
+
+jobs:
+  update_create_pr:
+    runs-on: ubuntu-latest
+    steps:
+    - uses: actions/checkout@v2
+    - name: Get current stable version
+      id: get_version
+      run: echo "::set-output name=version::$(cat webtop5-build/VERSION)"
+    - name: Set staging version
+      run: echo "staging-${{ github.event.inputs.war }}" > webtop5-build/VERSION
+    - name: Create/Update pull request
+      uses: peter-evans/create-pull-request@v3
+      with:
+        branch: ${{ steps.get_version.outputs.version }}-next
+        title: Update to upstream release ${{ steps.get_version.outputs.version }}-next
+        body: ''
+        commit-message: Update staging war ${{ github.event.inputs.war }}
+        draft: true
+        token: ${{ secrets.webtop_pr }}