Add reusable workflows

.github/workflows/callable-flex-update.yml

@@ -0,0 +1,51 @@
+name: Update Flex endpoint
+
+on:
+    workflow_call:
+        inputs:
+            branch:
+                default: main
+                required: false
+                type: string
+            contrib:
+                required: false
+                type: boolean
+            versions_json:
+                required: false
+                type: string
+
+jobs:
+    flex-update:
+        name: Update Flex endpoint
+        runs-on: Ubuntu-20.04
+
+        steps:
+            -
+                name: Checkout
+                uses: actions/checkout@v2
+                id: checkout
+                with:
+                    fetch-depth: 0
+
+            -
+                name: Install tools
+                run: |
+                    git config --global user.email ""
+                    git config --global user.name "github-action[bot]"
+                    cd .github
+                    wget -q -O recipes-checker.zip https://codeload.github.com/symfony-tools/recipes-checker/zip/refs/heads/main
+                    unzip recipes-checker.zip
+                    cd recipes-checker-main
+                    composer install --ansi --no-dev
+
+            -
+                name: Update Flex endpoint
+                run: |
+                    mkdir .github/flex-endpoint
+                    git ls-tree HEAD */*/* | php .github/recipes-checker-main/run generate:flex-endpoint ${{ github.repository }} ${{ inputs.branch }} flex/main .github/flex-endpoint ${{ inputs.versions_json }} ${{ inputs.contrib && '--contrib' || '' }}
+                    git switch flex/main
+                    git rm -q *.json
+                    mv .github/flex-endpoint/*.json .
+                    git add *.json
+                    git commit -m 'Update Flex endpoint' || true
+                    git push origin -f flex/main