Dynamically extract Go version from go.mod for build task

Author: wayneadams

ci/tasks/build/task.sh

@@ -11,10 +11,19 @@ cd om
 git remote set-url origin https://github.com/pivotal-cf/om
 git fetch -t -P -p
 
-# Kludge to get this thing buillt by go 1.22.5
-wget https://go.dev/dl/go1.22.5.linux-amd64.tar.gz
-tar xf go1.22.5.linux-amd64.tar.gz
-rm go1.22.5.linux-amd64.tar.gz
+# Extract Go version from go.mod file
+GO_VERSION=$(grep -E "^go [0-9]+\.[0-9]+(\.[0-9]+)?" go.mod | awk '{print $2}')
+if [ -z "$GO_VERSION" ]; then
+    echo "Failed to extract Go version from go.mod"
+    exit 1
+fi
+
+echo "Using Go version $GO_VERSION from go.mod"
+
+# Download and install the Go version specified in go.mod
+wget "https://go.dev/dl/go${GO_VERSION}.linux-amd64.tar.gz"
+tar xf "go${GO_VERSION}.linux-amd64.tar.gz"
+rm "go${GO_VERSION}.linux-amd64.tar.gz"
 rm -rf /usr/local/go
 mv go /usr/local