feat: Look for recipes in ./recipes/, build files in ./files/, and Containerfiles in ./containerfiles/ (#157)

Recipe files can now be put into their own directory `./recipes/`. This
directory is NEVER copied into the build so changes to a recipe will no
longer cause cache misses for builds. Here is an example of my build
changing the second to last module and only requiring the last 2 `RUN`
layers to be run again.

```
 => CACHED [stage-config 1/1] COPY ./config /config                                                                                                       0.0s
 => CACHED [stage-modules 1/2] COPY --from=ghcr.io/blue-build/modules:latest /modules /modules                                                            0.0s
 => CACHED [stage-modules 2/2] COPY ./modules /modules                                                                                                    0.0s
 => CACHED [stage-keys 1/1] COPY cosign.pub /keys/jp-desktop-gaming.pub                                                                                   0.0s
 => CACHED [stage-4  2/16] RUN --mount=type=bind,from=stage-keys,src=/keys,dst=/tmp/keys   mkdir -p /usr/etc/pki/containers/   && cp /tmp/keys/* /usr/et  0.0s
 => CACHED [stage-bins 1/3] COPY --from=gcr.io/projectsigstore/cosign /ko-app/cosign /bins/cosign                                                         0.0s
 => CACHED [stage-bins 2/3] COPY --from=docker.io/mikefarah/yq /usr/bin/yq /bins/yq                                                                       0.0s
 => CACHED [stage-bins 3/3] COPY --from=ghcr.io/blue-build/cli:main-installer /out/bluebuild /bins/bluebuild                                              0.0s
 => CACHED [stage-4  3/16] RUN --mount=type=bind,from=stage-bins,src=/bins,dst=/tmp/bins   mkdir -p /usr/bin/   && cp /tmp/bins/* /usr/bin/   && ostree   0.0s
 => CACHED [stage-4  4/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4  5/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4  6/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4  7/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4  8/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4  9/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4 10/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4 11/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4 12/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4 13/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => CACHED [stage-4 14/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind  0.0s
 => [stage-4 15/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind,from=  33.4s
 => [stage-4 16/16] RUN   --mount=type=tmpfs,target=/var   --mount=type=bind,from=stage-config,src=/config,dst=/tmp/config,rw   --mount=type=bind,from=s  0.7s
```

Support was also added to put all build files into `./files/` instead of
`./config/`. This is an all or nothing operation, meaning if there
exists a directory of `files` then the `config` directory will be
completely ignored. Work will have to be done in
https://github.com/blue-build/modules to allow users to put their files
directly in `./files/` and not `./files/files` for the `files` module or
`./files/scripts` for the scripts module.

Support was also added to move the `./config/containerfiles/` directory
to the root of the project. Now the directories you can find in the root
of projects are:

```
files/
containerfiles/
recipes/
```

README.md

@@ -138,7 +138,7 @@ You can then use this with `podman` or `buildah` to build and publish your image
 If you don't care about the details of the template, you can run the `build` command.
 
 ```bash
-bluebuild build ./config/recipe.yaml
+bluebuild build ./recipes/recipe.yaml
 ```
 
 This will template out the file and build with `buildah` or `podman`.
@@ -172,7 +172,7 @@ Currently, bluebuild completions are available for `bash`, `zsh`, `fish`, `power
 If you want to test your changes, you can do so by using the `rebase` command. This will create an image as a `.tar.gz` file, store it in `/etc/bluebuild`, an run `rpm-ostree rebase` on that newly built file.
 
 ```bash
-sudo bluebuild rebase config/recipe.yml
+sudo bluebuild rebase recipes/recipe.yml
 ```
 
 You can initiate an immediate restart by adding the `--reboot/-r` option.
@@ -182,7 +182,7 @@ You can initiate an immediate restart by adding the `--reboot/-r` option.
 When you've rebased onto a local image archive, you can update your image for your recipe by running:
 
 ```bash
-sudo bluebuild upgrade config/recipe.yml
+sudo bluebuild upgrade recipes/recipe.yml
 ```
 
 The `--reboot` argument can be used with this command as well.
@@ -272,7 +272,7 @@ build-image:
     - export COSIGN_PRIVATE_KEY=$(cat .secure_files/cosign.key)
   script:
     - sleep 5 # Wait a bit for the docker-in-docker service to start
-    - bluebuild build --push ./config/$RECIPE
+    - bluebuild build --push ./recipes/$RECIPE
 ```
 
 ## Future Features