fix: improve handling of GitHub token by removing newline characters

Author: KristjanESPERANTO

.github/workflows/container-build.yaml

@@ -46,9 +46,9 @@ jobs:
           file: container/Dockerfile
           push: true
           platforms: linux/amd64
+          # Optionally replace secrets.GITHUB_TOKEN with a PAT (use the same
+          # secret name or adjust this mapping) to avoid API rate limits when
+          # the pipeline fetches data for many repositories.
           secrets: |
-            # Optionally replace secrets.GITHUB_TOKEN with a PAT (store it under the same secret name
-            # or adjust this mapping) to avoid 401 responses and heavy rate limiting when the pipeline
-            # fetches metadata for thousands of modules.
             github_token=${{ secrets.GITHUB_TOKEN }}
           tags: ${{ steps.meta.outputs.image }}

container/Dockerfile

@@ -17,7 +17,7 @@ git config --global --add safe.directory /workspace
 git log -1
 TOKEN_FILE="/run/secrets/github_token"
 if [ -f "$TOKEN_FILE" ]; then
-	GITHUB_TOKEN_VALUE="$(cat "$TOKEN_FILE")"
+	GITHUB_TOKEN_VALUE="$(tr -d '\r\n' < "$TOKEN_FILE")"
 	if [ -n "$GITHUB_TOKEN_VALUE" ]; then
 		export GITHUB_TOKEN="$GITHUB_TOKEN_VALUE"
 	fi