Refactor Command Structs and create Earthly build

Earthfile

@@ -0,0 +1,41 @@
+VERSION 0.7
+
+FROM registry.fedoraproject.org/fedora-toolbox
+
+ARG --global IMAGE
+
+cosign:
+    FROM gcr.io/projectsigstore/cosign 
+    
+    SAVE ARTIFACT /ko-app/cosign cosign
+
+install:
+	FROM rust
+	COPY . /app
+	WORKDIR /app
+
+	RUN cargo build --release
+
+	SAVE ARTIFACT target/release/ublue
+
+build:
+	BUILD +install
+
+    RUN dnf install --refresh -y podman buildah skopeo
+
+    COPY +cosign/cosign /usr/bin/cosign
+	COPY +install/ublue /usr/bin/ublue
+
+	ARG TAG
+	IF [ "$TAG" != "" ]
+	    SAVE IMAGE --push $CI_REGISTRY_IMAGE:$TAG
+
+		ARG LATEST=false
+
+		IF [ "$LATEST" = "true" ]
+		    SAVE IMAGE --push $CI_REGISTRY_IMAGE:latest
+		END
+	END
+
+all:
+	BUILD --platform=linux/amd64 +build