Handle Go version used to build image (#28)

* do not use Go 1.21

* auto install latest Go version

templates/docker/Dockerfile

@@ -43,17 +43,8 @@ RUN apt-get update \
 
 ## NOTE(neoaggelos): Go version used to build components
 ## !!!IMPORTANT!!! Keep up to date with "snapcraft.yaml:parts.build-deps.build-snaps.go"
-RUN wget https://go.dev/dl/go1.22.4.linux-amd64.tar.gz \
-    && mkdir -p /usr/local/go122 \
-    && tar -C /usr/local/go122 -xzf go1.22.4.linux-amd64.tar.gz \
-    && ln -s /usr/local/go122/go/bin/go /usr/local/bin/go
-
-## NOTE(neoaggelos): runc needs Go 1.21 to build
-## !!!IMPORTANT!!! Drop this after runc 1.1.13 is released https://github.com/opencontainers/runc/issues/4233#issuecomment-2155883159
-RUN wget https://go.dev/dl/go1.21.11.linux-amd64.tar.gz \
-    && mkdir -p /usr/local/go121 \
-    && tar -C /usr/local/go121 -xzf go1.21.11.linux-amd64.tar.gz \
-    && ln -s /usr/local/go121/go/bin/go /usr/local/bin/go_121
+ADD install-go.sh
+RUN install-go.sh 1.22 && ln -s /usr/local/go/bin/go /usr/local/bin/go
 
 ## Prepare build environment
 ENV SNAPCRAFT_PART_INSTALL=/out

templates/docker/install-go.sh

@@ -0,0 +1,15 @@
+#!/bin/bash -xe
+
+# Author: Angelos Kolaitis <[email protected]>
+#
+# Usage:
+#    $ install-go.sh 1.22
+#
+# Description: Download latest go version and install under /usr/local/go
+
+VERSION="$1"
+
+fname="$(curl -s https://go.dev/dl/ | grep -o "go$VERSION.*.linux-amd64.tar.gz" | head -1)"
+wget "https://go.dev/dl/$fname"
+tar -C /usr/local -xvzf "$fname"
+rm "$fname"