docs(README): update installation instructions for various distributions

.gitea/workflows/release.yml

@@ -48,7 +48,7 @@ jobs:
             [ "$GOOS" = "windows" ] && EXT=".exe"
             NAME="unitdore-${GOOS}-${GOARCH}${EXT}"
             GOOS="$GOOS" GOARCH="$GOARCH" go build \
-              -ldflags "-X main.version=${VERSION}" \
+              -ldflags "-X github.com/warkanum/unitdore/cmd.version=${VERSION}" \
               -o "$NAME" .
             echo "Built $NAME"
           done
@@ -215,7 +215,7 @@ jobs:
           for GOARCH in amd64 arm64; do
             GOOS=linux GOARCH=$GOARCH go build \
               -trimpath \
-              -ldflags "-X main.version=${PKGVER}" \
+              -ldflags "-X github.com/warkanum/unitdore/cmd.version=${PKGVER}" \
               -o unitdore .
 
             PKGDIR="unitdore_${PKGVER}_${GOARCH}"