data provider: try to automatically initialize it if required

.github/workflows/release.yml

@@ -111,10 +111,6 @@ jobs:
           $DATE_TIME = ([datetime]::Now.ToUniversalTime().toString("yyyy-MM-ddTHH:mm:ssZ")) | Out-String
           go build -ldflags "-s -w -X github.com/drakkan/sftpgo/version.commit=$GIT_COMMIT -X github.com/drakkan/sftpgo/version.date=$DATE_TIME" -o sftpgo.exe
 
-      - name: Initialize data provider
-        run: ./sftpgo initprovider
-        shell: bash
-
       - name: Get SFTPGo version
         id: get_version
         run: echo ::set-output name=VERSION::${GITHUB_REF/refs\/tags\//}