workflows/docker: Remove installation directory

As discussed in #2171 the CAA_IMAGE envs are not working in the e2e code
and combined with the installation directory, it seems seems to add confusion
when we need different CAA images for decoupling of different architectures,
so switch docker to use the same approach as libvirt for consistency.

.github/workflows/e2e_docker.yaml

@@ -11,11 +11,7 @@ on:
         required: true
         type: string
       caa_image:
-        required: true
-        type: string
-      caa_image_tag:
-        required: false
-        default: "latest"
+        description: The cloud-api-adaptor OCI image (including tag) to test
         type: string
       install_directory_artifact:
         description: The archive name of the install directory
@@ -83,18 +79,24 @@ jobs:
         with:
           go-version: ${{ env.GO_VERSION }}
 
-      - name: Get the install directory
-        if: ${{ inputs.install_directory_artifact != '' }}
-        uses: actions/download-artifact@v4
-        with:
-          name: ${{ inputs.install_directory_artifact }}
-          path: src/cloud-api-adaptor/install
+      - name: Install kustomize
+        run: |
+          command -v kustomize >/dev/null || \
+          curl -s "https://raw.githubusercontent.com/kubernetes-sigs/kustomize/master/hack/install_kustomize.sh" | \
+            sudo bash -s /usr/local/bin
+
+      - name: Update kustomization configuration
+        run: |
+          cd "install/overlays/docker"
+          kustomize edit set image "cloud-api-adaptor=${{ inputs.caa_image }}"
+          # Print for debugging
+          echo "::group::docker kustomization"
+          cat kustomization.yaml
+          echo "::endgroup::"
 
       - name: Config docker
         run: |
           cat <<- EOF > docker.properties
-          CAA_IMAGE="${{ inputs.caa_image }}"
-          CAA_IMAGE_TAG="${{ inputs.caa_image_tag }}"
           DOCKER_PODVM_IMAGE="${{ inputs.podvm_image }}"
           DOCKER_HOST="unix:///var/run/docker.sock"
           DOCKER_NETWORK_NAME="kind"

.github/workflows/e2e_run_all.yaml

@@ -116,6 +116,7 @@ jobs:
   # IMPORTANT: If you are enabling e2e tests for a given provider,
   # then please update the PROVIDERS list (space-separated names, e.g.,
   # "aws libvirt").
+  # TODO - when the packer approach is removed this can go as well
   prep_install:
     runs-on: ubuntu-24.04
     outputs:
@@ -303,8 +304,7 @@ jobs:
           - amd64
     uses: ./.github/workflows/e2e_docker.yaml
     with:
-      caa_image: ${{ inputs.registry }}/cloud-api-adaptor
-      caa_image_tag: ${{ inputs.caa_image_tag }}
+      caa_image: ${{ inputs.registry }}/cloud-api-adaptor:${{ inputs.caa_image_tag }}-amd64-dev
       podvm_image: ${{ needs.podvm_mkosi_amd64.outputs.docker_oci_image }}
       install_directory_artifact: install_directory
       git_ref: ${{ inputs.git_ref }}