Fix bug in 11541 : Ensure regctl is added to GitHub path rather than installing in a directory that is access restricted

Author: tdonohue

.github/workflows/reusable-docker-build.yml

@@ -78,8 +78,6 @@ env:
   # Registry used during building of Docker images. (All images are later copied to docker.io registry)
   # We use GitHub's Container Registry to avoid aggressive rate limits at DockerHub.
   DOCKER_BUILD_REGISTRY: ghcr.io
-  # Version of 'regctl' to use for copying images to DOCKER_BUILD_REGISTRY
-  REGCTL_VERSION: 'v0.9.2'
 
 jobs:
   docker-build:
@@ -301,8 +299,11 @@ jobs:
       # See https://github.com/regclient/regclient/blob/main/docs/regctl.md
       - name: Install regctl for Docker registry tools
         run: |
-          curl -L https://github.com/regclient/regclient/releases/download/${REGCTL_VERSION}/regctl-linux-amd64 > /usr/bin/regctl
-          chmod 755 /usr/bin/regctl
+          export REGCTL_VERSION=v0.9.2
+          mkdir -p bin
+          curl -sSLo bin/regctl https://github.com/regclient/regclient/releases/download/${REGCTL_VERSION}/regctl-linux-amd64
+          chmod a+x bin/regctl
+          echo "$(pwd)/bin" >> $GITHUB_PATH
 
       # This recreates Docker tags for DockerHub
       - name: Add Docker metadata for image