Nvidia Jetson ffmpeg + TensorRT support (#6458)

* Non-Jetson changes

Required for later commits:
- Allow base image to be overridden (and don't assume its WORKDIR)
- Ensure python3.9
- Map hwaccel decode presets as strings instead of lists
Not required:
- Fix existing documentation
- Simplify hwaccel scale logic

* Prepare for multi-arch tensorrt build

* Add tensorrt images for Jetson boards

* Add Jetson ffmpeg hwaccel

* Update docs

* Add CODEOWNERS

* CI

* Change default model from yolov7-tiny-416 to yolov7-320

In my experience the tiny models perform markedly worse without being
much faster

* fixup! Update docs

docker/tensorrt/trt.hcl

@@ -1,19 +1,47 @@
+variable "ARCH" {
+  default = "amd64"
+}
+variable "BASE_IMAGE" {
+  default = null
+}
+variable "SLIM_BASE" {
+  default = null
+}
+variable "TRT_BASE" {
+  default = null
+}
+
+target "_build_args" {
+  args = {
+    BASE_IMAGE = BASE_IMAGE,
+    SLIM_BASE = SLIM_BASE,
+    TRT_BASE = TRT_BASE
+  }
+  platforms = ["linux/${ARCH}"]
+}
+
+target wget {
+  dockerfile = "docker/main/Dockerfile"
+  target = "wget"
+  inherits = ["_build_args"]
+}
+
 target deps {
   dockerfile = "docker/main/Dockerfile"
-  platforms = ["linux/amd64"]
   target = "deps"
+  inherits = ["_build_args"]
 }
 
 target rootfs {
   dockerfile = "docker/main/Dockerfile"
-  platforms = ["linux/amd64"]
   target = "rootfs"
+  inherits = ["_build_args"]
 }
 
 target wheels {
   dockerfile = "docker/main/Dockerfile"
-  platforms = ["linux/amd64"]
   target = "wheels"
+  inherits = ["_build_args"]
 }
 
 target devcontainer {
@@ -22,27 +50,45 @@ target devcontainer {
   target = "devcontainer"
 }
 
-target tensorrt {
-  dockerfile = "docker/tensorrt/Dockerfile"
+target "trt-deps" {
+  dockerfile = "docker/tensorrt/Dockerfile.base"
   context = "."
   contexts = {
     deps = "target:deps",
+  }
+  inherits = ["_build_args"]
+}
+
+target "tensorrt-base" {
+  dockerfile = "docker/tensorrt/Dockerfile.base"
+  context = "."
+  contexts = {
+    deps = "target:deps",
+  }
+  inherits = ["_build_args"]
+}
+
+target "tensorrt" {
+  dockerfile = "docker/tensorrt/Dockerfile.${ARCH}"
+  context = "."
+  contexts = {
+    wget = "target:wget",
+    tensorrt-base = "target:tensorrt-base",
     rootfs = "target:rootfs"
     wheels = "target:wheels"
   }
-  platforms = ["linux/amd64"]
   target = "frigate-tensorrt"
+  inherits = ["_build_args"]
 }
 
-target devcontainer-trt {
-  dockerfile = "docker/tensorrt/Dockerfile"
+target "devcontainer-trt" {
+  dockerfile = "docker/tensorrt/Dockerfile.amd64"
   context = "."
   contexts = {
-    deps = "target:deps",
-    rootfs = "target:rootfs"
-    wheels = "target:wheels"
+    wheels = "target:wheels",
+    trt-deps = "target:trt-deps",
     devcontainer = "target:devcontainer"
   }
   platforms = ["linux/amd64"]
   target = "devcontainer-trt"
-}
+}