gatus: pin Go to gatus's go.mod version, modernize Alpine path to shared helpers (#16893)

install/gatus-install.sh

@@ -20,8 +20,8 @@ setup_deb_based() {
     libcap2-bin
   msg_ok "Installed Dependencies"
 
-  setup_go
   fetch_and_deploy_gh_release "gatus" "TwiN/gatus" "tarball"
+  GO_VERSION="$(grep -m1 '^go ' /opt/gatus/go.mod | awk '{print $2}')" setup_go
 
   msg_info "Configuring gatus"
   cd /opt/gatus
@@ -59,19 +59,16 @@ setup_alpine() {
   $STD apk add --no-cache --repository=https://dl-cdn.alpinelinux.org/alpine/edge/community go
   msg_ok "Installed dependencies"
 
-  RELEASE=$(curl -s https://api.github.com/repos/TwiN/gatus/releases/latest | grep "tag_name" | awk '{print substr($2, 3, length($2)-4) }')
-  msg_info "Installing gatus v${RELEASE}"
-  temp_file=$(mktemp)
-  mkdir -p /opt/gatus
-  curl -fsSL "https://github.com/TwiN/gatus/archive/refs/tags/v${RELEASE}.tar.gz" -o "$temp_file"
-  tar zxf "$temp_file" --strip-components=1 -C /opt/gatus
+  fetch_and_deploy_gh_release "gatus" "TwiN/gatus" "tarball"
+
+  msg_info "Configuring gatus"
   cd /opt/gatus
+  $STD go get golang.org/x/net@v0.55.0
   $STD go mod tidy
   CGO_ENABLED=0 GOOS=linux go build -a -installsuffix cgo -o gatus .
   setcap CAP_NET_RAW+ep gatus
   mv config.yaml config
-  echo "${RELEASE}" >/opt/gatus_version.txt
-  msg_ok "Installed gatus v${RELEASE}"
+  msg_ok "Configured gatus"
 
   msg_info "Enabling gatus Service"
   cat <<EOF >/etc/init.d/gatus
@@ -99,8 +96,6 @@ EOF
   msg_info "Starting gatus"
   $STD service gatus start
   msg_ok "Started gatus"
-
-  rm -f "$temp_file"
 }
 
 run_os_setup