Create latest action for dynamic files

Currently builds a shilds.json file with the latest version based on the gradle file

.github/workflows/latest.yml

@@ -0,0 +1,43 @@
+name: Update dynamic files
+
+# When pushing to the master branch
+on:
+  push:
+    branches:
+      - master
+
+
+# parameters
+env:
+  TAG: latest
+  SHIELDS: shields.json
+
+
+# Workflow in ubuntu
+jobs:
+  update:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Get the repository files
+        uses: actions/checkout@v3
+
+      - name: Create ${{ env.SHIELDS }} file
+        run: |
+          cat <<EOF | tee ${{ env.SHIELDS }}
+          {
+            "version": "v$(sed -ne "s/ *versionName \+['\"]\([^'\"]*\)['\"]/\1/p" app/build.gradle)"
+          }
+          EOF
+        
+      - name: Update ${{ env.TAG }} tag to current commit
+        # equivalent to EndBug/latest-tag@latest but simpler
+        run: |
+          git tag --force ${{ env.TAG }}
+          git push --force origin tag ${{ env.TAG }}
+          
+      - name: Upload files to ${{ env.TAG }} release
+        uses: softprops/action-gh-release@v1
+        with:
+          tag_name: ${{ env.TAG }}
+          files: |
+            ${{ env.SHIELDS }}