ci(opentf): Optimise builds with earthly

images/.utils/Earthfile

@@ -5,4 +5,16 @@ SCAN:
     FROM ../mirror+trivy
     WITH DOCKER --load image=+container
         RUN trivy image image:latest
-    END
\ No newline at end of file
+    END
+
+LABEL:
+    COMMAND
+    ARG image
+    ARG EARTHLY_GIT_CO_AUTHORS
+    ARG EARTHLY_GIT_BRANCH
+    LABEL org.opencontainers.image.title="${image}"
+    LABEL org.opencontainers.image.source="https://git.shivering-isles.com/shivering-isles/infrastructure-gitops/-/tree/main/images/${image}"
+    LABEL org.opencontainers.image.url="https://git.shivering-isles.com/shivering-isles/infrastructure-gitops/-/tree/main/images/${image}"
+    LABEL org.opencontainers.image.version="${EARTHLY_GIT_BRANCH}"
+    LABEL org.opencontainers.image.description="Container for ${image} by ${author}"
+    LABEL org.opencontainers.image.authors="${EARTHLY_GIT_CO_AUTHORS}"
\ No newline at end of file

images/opentf/Earthfile

 VERSION 0.7
 
+src:
+    FROM ../mirror+golang
+    ARG branch=main
+    WORKDIR /go-workdir
+    GIT CLONE --branch=${branch} https://github.com/opentofu/opentofu.git ./
+    SAVE ARTIFACT ./ ./src
+
 build:
     FROM ../mirror+golang
     WORKDIR /go-workdir
-    GIT CLONE --branch=v1.6.0-alpha2 https://github.com/opentofu/opentofu.git ./
+    COPY +src/src/go.mod ./
+    COPY +src/src/go.sum ./
     ENV CGO_ENABLED=0
+    RUN go mod download && go mod verify
+    COPY +src/src/ ./
     RUN go build -ldflags "-s -w" -mod=readonly -trimpath ./cmd/tofu
     SAVE ARTIFACT ./tofu ./tofu
 
 container-internal:
     FROM ../mirror+distroless-static
+    ARG branch=main
     COPY +build/tofu /usr/local/bin/tofu
     COPY +build/tofu /usr/local/bin/opentofu
     COPY +build/tofu /usr/local/bin/opentf
     ENTRYPOINT ["/usr/local/bin/tofu"]
+    DO ../.utils/+LABEL --image=opentf --version=${branch}
 
 container:
     FROM ../mirror+golang
@@ -22,10 +34,10 @@ container:
     ARG tag=$(awk -F'=' '$1 == "release" {print $2}' .release)
     ARG latest=false
     IF [ $latest = "true" ]
-        FROM +container-internal
+        FROM +container-internal --branch=v${tag}
         SAVE IMAGE --push ${registry}:latest
     ELSE
-        FROM +container-internal
+        FROM +container-internal --branch=v${tag}
         LABEL "quay.expires-after"="12w"
     END
     SAVE IMAGE --push ${registry}:${tag}