🐛 Fix duplicate build-args key in Build-Publish workflow

The 'Build and push' step declared 'build-args:' twice, which is
invalid YAML (duplicate mapping key) and fails the whole workflow with
'This run likely failed because of a workflow file issue'. As a result
no cortex images publish, which in turn breaks the operator E2E that
pulls ghcr.io/rossoctl/cortex/authbridge-*:latest.

Merge the two build-arg sources (static matrix build_args used by
authbridge-lite, and the dynamically resolved CPEX_FFI_* args used by
authbridge-cpex) into a single multiline build-args value. Only one
image sets each source, so concatenating them is safe.

Signed-off-by: Mariusz Sabath <mrsabath@gmail.com>

Author: mrsabath

.github/workflows/build.yaml

@@ -146,9 +146,15 @@ jobs:
         with:
           context: ${{ matrix.image_config.context }}
           file: ${{ matrix.image_config.context }}/${{ matrix.image_config.dockerfile }}
-          build-args: ${{ matrix.image_config.build_args }}
+          # Merge both build-arg sources into a single key: static per-image
+          # args from the matrix (e.g. authbridge-lite GO_BUILD_TAGS) plus the
+          # dynamically resolved args (authbridge-cpex CPEX_FFI_*). A duplicate
+          # `build-args:` key is invalid YAML and fails the whole workflow; only
+          # one image sets each source, so concatenating them is safe.
+          build-args: |
+            ${{ matrix.image_config.build_args }}
+            ${{ steps.buildargs.outputs.args }}
           push: true
           platforms: linux/amd64,linux/arm64
           tags: ${{ steps.meta.outputs.tags }}
           labels: ${{ steps.meta.outputs.labels }}
-          build-args: ${{ steps.buildargs.outputs.args }}