string instead of float to keep trailing 0

(and for consistency also 2.2)

Author: alcohol

.github/workflows/1.10.yaml

@@ -18,7 +18,7 @@ env:
   DOCKERHUB_SLUG: composer/composer
   ECR_SLUG: public.ecr.aws/u0u1j5s3/composer
   GHCR_SLUG: ghcr.io/composer/docker
-  DIRECTORY: 1.10
+  DIRECTORY: '1.10'
 
 jobs:
 

.github/workflows/2.2.yaml

@@ -18,7 +18,7 @@ env:
   DOCKERHUB_SLUG: composer/composer
   ECR_SLUG: public.ecr.aws/u0u1j5s3/composer
   GHCR_SLUG: ghcr.io/composer/docker
-  DIRECTORY: 2.2
+  DIRECTORY: '2.2'
 
 jobs: