build (docker-bake.hcl): add bake file

Author: pythoninthegrass

{{cookiecutter.project_slug}}/docker-bake.hcl

@@ -0,0 +1,67 @@
+// Variables with defaults that can be overridden
+variable "REGISTRY" {
+  default = "ghcr.io"
+}
+
+variable "IMAGE_NAME" {
+  default = "mvp"
+}
+
+variable "TAG" {
+  default = "latest"
+}
+
+// Base target with shared configuration
+target "docker-metadata-action" {
+  tags = [
+    "${REGISTRY}/${IMAGE_NAME}:${TAG}",
+    "${REGISTRY}/${IMAGE_NAME}:latest",
+  ]
+}
+
+// Default target that extends the base
+target "build" {
+  inherits = ["docker-metadata-action"]
+  context = "."
+  dockerfile = "Dockerfile"
+  // Platform will be set from GitHub Actions
+  // cache-from and cache-to will also be set from GitHub Actions
+  args = {
+    PYTHON_VERSION = "3.12.10"
+    // Additional build args can be defined here
+  }
+  // Output image will be pushed if push=true is set in GitHub Actions
+}
+
+// Group target to build both platforms
+group "default" {
+  targets = ["build"]
+}
+
+// Optional specific targets for each platform if needed
+target "amd64" {
+  inherits = ["build"]
+  platforms = ["linux/amd64"]
+  cache-from = ["type=gha,scope=linux/amd64"]
+  cache-to = ["type=gha,mode=max,scope=linux/amd64"]
+}
+
+target "arm64" {
+  inherits = ["build"]
+  platforms = ["linux/arm64"]
+  cache-from = ["type=gha,scope=linux/arm64"]
+  cache-to = ["type=gha,mode=max,scope=linux/arm64"]
+  // Optional arm64-specific args
+  args = {
+    PYTHON_VERSION = "3.12.10"
+    OPENBLAS_NUM_THREADS = "1"
+    MKL_NUM_THREADS = "1"
+    NUMEXPR_NUM_THREADS = "1"
+  }
+}
+
+// Matrix build target if you prefer to use it directly in bake
+target "multi-platform" {
+  inherits = ["build"]
+  platforms = ["linux/amd64", "linux/arm64"]
+}