ci: add Docker manifests for Osiris

Signed-off-by: Xe Iaso <me@xeiaso.net>

docker-bake.hcl

@@ -0,0 +1,28 @@
+variable "ALPINE_VERSION" { default = "3.22" }
+variable "GITHUB_SHA" { default = "devel" }
+
+group "default" {
+  targets = [
+    "osiris",
+  ]
+}
+
+target "osiris" {
+  args = {
+    ALPINE_VERSION = "3.22"
+  }
+  context    = "."
+  dockerfile = "./docker/osiris.Dockerfile"
+  platforms = [
+    "linux/amd64",
+    "linux/arm64",
+    "linux/arm/v7",
+    "linux/ppc64le",
+    "linux/riscv64",
+  ]
+  pull = true
+  tags = [
+    "ghcr.io/techarohq/osiris:${GITHUB_SHA}",
+    "ghcr.io/techarohq/osiris:main"
+  ]
+}