diff --git a/.github/workflows/base-glibc-busybox-bash.yaml b/.github/workflows/base-glibc-busybox-bash.yaml
index 300702a8..9629acd3 100644
--- a/.github/workflows/base-glibc-busybox-bash.yaml
+++ b/.github/workflows/base-glibc-busybox-bash.yaml
@@ -20,9 +20,12 @@ jobs:
       # version tags or checksum IDs, but not via "latest".
       MAJOR_VERSION: 3
       MINOR_VERSION: 1
-      IMAGE_NAME: base-glibc-busybox-bash
       BUSYBOX_VERSION: '1.36.1'
       DEBIAN_VERSION: '12.2'
+      # Used for testing -- set to something like 'tmp-' or 'test-' to prefix
+      # images with this name during testing
+      IMAGE_PREFIX: "tmp-"
+      IMAGE_NAME: base-glibc-busybox-bash
 
     steps:
     - uses: actions/checkout@v4
@@ -36,9 +39,9 @@ jobs:
       id: build
       run: |
         set -xeu
-        cd 'images/${{ env.IMAGE_NAME }}'
 
-        image_name='${{ env.IMAGE_NAME }}'
+        image_name='${{ env.IMAGE_PREFIX }}${{ env.IMAGE_NAME }}'
+        image_dir='images/${{ env.IMAGE_NAME }}'
         tags='
           ${{ env.MAJOR_VERSION }}
           ${{ env.MAJOR_VERSION }}.${{ env.MINOR_VERSION }}
@@ -46,10 +49,13 @@ jobs:
         '
         # Adds image and tags to outputs which can be used in later steps.
         printf %s\\n \
-          "image=${image_name}" \
+          "image_dir=${image_dir}" \
+          "image_name=${image_name}" \
           "tags=$( echo ${tags} )" \
           >> $GITHUB_OUTPUT
 
+        cd 'images/${{ env.IMAGE_NAME }}'
+
         # Create manifest (which is considered arch-independent)
         for tag in ${tags} ; do
           buildah manifest create "${image_name}:${tag}"
@@ -112,7 +118,8 @@ jobs:
 
     - name: Test
       run: |
-        image='${{ steps.build.outputs.image }}'
+        image_name='${{ steps.build.outputs.image_name }}'
+        image_dir='${{ steps.build.outputs.image_dir }}'
 
         # Extract image ids from manifest to test.
         ids="$(
@@ -133,7 +140,7 @@ jobs:
           buildah bud \
             --build-arg=base="${id}" \
             --file=Dockerfile.test \
-            "images/${image}"
+            "${image_dir}"
         done
         buildah rmi --prune || true
 
@@ -143,9 +150,16 @@ jobs:
         #               => Try to use the REST API to check for duplicate tags and exit if they exist
         response="$(
           curl -sL \
-            'https://quay.io/api/v1/repository/bioconda/${{ steps.build.outputs.image }}/tag/'
+            'https://quay.io/api/v1/repository/bioconda/${{ steps.build.outputs.image_name }}/tag/'
           )"
 
+        # This might be the first time making this image (e.g., will likely
+        # happen when using a test prefix), in which case there will be no
+        # available images.
+        if [ "$(echo "${response}" | jq -r '.error_message')" == "Requires authentication" ]; then
+          exit 0
+        fi
+
         existing_tags="$(
           printf %s "${response}" \
             | jq -r '.tags[]|select(.end_ts == null or .end_ts >= now)|.name'
@@ -169,23 +183,25 @@ jobs:
           esac
         done
 
-    - if: ${{ github.ref == 'refs/heads/main' }}
+    - if: ${{ github.ref == 'refs/heads/test-push' }}
       name: Push
       uses: redhat-actions/push-to-registry@v2
       with:
-        image: ${{ steps.build.outputs.image }}
+        image: ${{ steps.build.outputs.image_name }}
         tags: ${{ steps.build.outputs.tags }}
-        registry: ${{ secrets.QUAY_BIOCONDA_REPO }}
+        registry: quay.io/bioconda
         username: ${{ secrets.QUAY_BIOCONDA_USERNAME }}
         password: ${{ secrets.QUAY_BIOCONDA_TOKEN }}
 
-    - if: ${{ github.ref == 'refs/heads/main' }}
+    - if: ${{ github.ref == 'refs/heads/test-push' }}
       name: Test Pushed
       run: |
-        image='${{ env.IMAGE_NAME }}'
+
+        image_name='${{ steps.build.outputs.image_name }}'
+        image_dir='${{ steps.build.outputs.image_dir }}'
         ids="$(
           for tag in ${{ steps.build.outputs.tags }} ; do
-            buildah manifest inspect "${image}:${tag}" \
+            buildah manifest inspect "${image_name}:${tag}" \
               | jq -r '.manifests[]|.digest' \
               | while read id ; do
                   buildah images --format '{{.ID}}{{.Digest}}' \
@@ -199,6 +215,6 @@ jobs:
           buildah bud \
             --build-arg=base="${id}" \
             --file=Dockerfile.test \
-            "images/${image}"
+            "${image_dir}"
         done
         buildah rmi --prune || true