Refactor Docker build workflows (#1221)

* Initial implementation

* Multiple fixes and improvemens

* Better `curl` retries timing

* Remove unused `TARGETOS` and `TARGETVARIANT` vars; add the version fetch fallback code to the build scripts

* Move the fallback code before the var usage

* Use double braces to make the code compatible with the `set -u`

---------

Co-authored-by: Konstantin Koval

ui/apollo.config.js

@@ -6,7 +6,7 @@ const schemasFolder = path.join(__dirname, '..', 'api', 'graphql', 'resolvers');
 
 let completeSchema;
 try {
-   completeSchema = readdirSync(schemasFolder)
+  completeSchema = readdirSync(schemasFolder)
     .filter(x => x.endsWith('.graphql'))
     .map(x => {
       const filePath = path.join(schemasFolder, x);