chore: import upstream snapshot with attribution

docker/docker-bake.hcl

@@ -0,0 +1,40 @@
+variable "HAYSTACK_VERSION" {
+  default = "main"
+}
+
+variable "GITHUB_REF" {
+  default = ""
+}
+
+variable "IMAGE_NAME" {
+  default = "deepset/haystack"
+}
+
+variable "IMAGE_TAG_SUFFIX" {
+  default = "local"
+}
+
+variable "BASE_IMAGE_TAG_SUFFIX" {
+  default = "local"
+}
+
+variable "IS_STABLE" {
+  default = "false"
+}
+
+# 2.Y.Z releases are also tagged as "stable"
+# Example: 2.99.0 is tagged as base-2.99.0 and stable
+
+target "base" {
+  dockerfile = "Dockerfile.base"
+  tags = "${compact([
+    "${IMAGE_NAME}:base-${IMAGE_TAG_SUFFIX}",
+    equal("${IS_STABLE}", "true") ? "${IMAGE_NAME}:stable" : ""
+  ])}"
+  args = {
+    build_image = "python:3.12-slim@sha256:090ba77e2958f6af52a5341f788b50b032dd4ca28377d2893dcf1ecbdfdfe203"
+    base_image = "python:3.12-slim@sha256:090ba77e2958f6af52a5341f788b50b032dd4ca28377d2893dcf1ecbdfdfe203"
+    haystack_version = "${HAYSTACK_VERSION}"
+  }
+  platforms = ["linux/amd64", "linux/arm64"]
+}