chore(ci): remove some redundant environment variables

.github/workflows/docker-build.yml

@@ -20,6 +20,11 @@ on:
 permissions:
   contents: read
 
+env:
+  IMAGE_NAME: "freqtradeorg/freqtrade"
+  CACHE_IMAGE: "freqtradeorg/freqtrade_cache"
+  GHCR_IMAGE_NAME: "ghcr.io/freqtrade/freqtrade"
+
 jobs:
   deploy-docker:
     name: "Deploy Docker x64 and armv7l"

build_helpers/publish_docker_arm64.sh

@@ -1,11 +1,6 @@
 #!/bin/sh
 
 # Use BuildKit, otherwise building on ARM fails
-export DOCKER_BUILDKIT=1
-
-IMAGE_NAME=freqtradeorg/freqtrade
-CACHE_IMAGE=freqtradeorg/freqtrade_cache
-GHCR_IMAGE_NAME=ghcr.io/freqtrade/freqtrade
 
 # Replace / with _ to create a valid tag
 TAG=$(echo "${BRANCH_NAME}" | sed -e "s/\//_/g")

build_helpers/publish_docker_multi.sh

@@ -2,8 +2,6 @@
 
 # The below assumes a correctly setup docker buildx environment
 
-IMAGE_NAME=freqtradeorg/freqtrade
-CACHE_IMAGE=freqtradeorg/freqtrade_cache
 # Replace / with _ to create a valid tag
 TAG=$(echo "${BRANCH_NAME}" | sed -e "s/\//_/g")
 TAG_PLOT=${TAG}_plot