dockerfile: enhanced to match netlify pipeline

Signed-off-by: CrazyMax <crazy-max@users.noreply.github.com>

docker-bake.hcl

@@ -0,0 +1,21 @@
+variable "JEKYLL_ENV" {
+  default = "development"
+}
+
+group "default" {
+  targets = ["release"]
+}
+
+target "release" {
+  target = "release"
+  args = {
+    JEKYLL_ENV = JEKYLL_ENV
+  }
+  no-cache-filter = ["upstream-resources"]
+  output = ["./_site"]
+}
+
+target "vendor" {
+  target = "vendor"
+  output = ["."]
+}