From 562f469fbca34dbdd5eebab8191aa2957bd2fb87 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Pawe=C5=82=20Cierzniakowski?= <pawel@cierzniakowski.pl>
Date: Sun, 9 Aug 2026 15:16:58 +0200
Subject: [PATCH] test: expose the action at the repository root to probe uses
 URL parsing

---
 action.yaml | 45 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 45 insertions(+)
 create mode 100644 action.yaml

diff --git a/action.yaml b/action.yaml
new file mode 100644
index 0000000..84c64c7
--- /dev/null
+++ b/action.yaml
@@ -0,0 +1,45 @@
+name: Resolve buildx cache settings
+description: >-
+  Turns the DOCKER_CACHE_* variables exported by the runner into buildx driver options and
+  cache refs. Missing variables degrade the job to a build without cache instead of failing it.
+
+inputs:
+  cache-image:
+    description: Cache image path without the registry host (e.g. "org/repo/app").
+    required: true
+
+outputs:
+  driver-opts:
+    description: driver-opts for docker/setup-buildx-action; empty when the cache registry needs no network pinning.
+    value: ${{ steps.resolve.outputs.driver-opts }}
+  cache-from:
+    description: cache-from ref for docker/build-push-action; empty disables cache reads.
+    value: ${{ steps.resolve.outputs.cache-from }}
+  cache-to:
+    description: cache-to ref for docker/build-push-action; empty disables cache writes.
+    value: ${{ steps.resolve.outputs.cache-to }}
+
+runs:
+  using: composite
+  steps:
+    - id: resolve
+      shell: bash
+      env:
+        CACHE_IMAGE: ${{ inputs.cache-image }}
+      run: |
+        if [ -n "${DOCKER_CACHE_NETWORK}" ]; then
+          echo "driver-opts=network=${DOCKER_CACHE_NETWORK}" >> "$GITHUB_OUTPUT"
+        else
+          echo "driver-opts=" >> "$GITHUB_OUTPUT"
+        fi
+
+        if [ -z "${DOCKER_CACHE_TYPE}" ] || [ -z "${DOCKER_CACHE_SERVER}" ]; then
+          echo "::warning::DOCKER_CACHE_* not set on the runner - building without cache"
+          echo "cache-from=" >> "$GITHUB_OUTPUT"
+          echo "cache-to=" >> "$GITHUB_OUTPUT"
+          exit 0
+        fi
+
+        ref="${DOCKER_CACHE_SERVER}/${CACHE_IMAGE}:cache"
+        echo "cache-from=type=${DOCKER_CACHE_TYPE},ref=${ref},registry.insecure=true" >> "$GITHUB_OUTPUT"
+        echo "cache-to=type=${DOCKER_CACHE_TYPE},ref=${ref},registry.insecure=true,mode=max" >> "$GITHUB_OUTPUT"