fix(pr-validation): install wget before downloading actionlint

Install wget via apt-get before using it for actionlint download.
The act runner ubuntu-latest image may not have wget pre-installed.

Co-Authored-By: Paperclip <noreply@paperclip.ing>

.github/workflows/pr-validation.yaml

@@ -21,6 +21,7 @@ jobs:
         run: |
           ACTIONLINT_VERSION="1.7.7"
           mkdir -p "$HOME/.local/bin"
+          apt-get install -y wget -qq >/dev/null 2>&1 || true
           wget -qO- "https://github.com/rhysd/actionlint/releases/download/v${ACTIONLINT_VERSION}/actionlint_${ACTIONLINT_VERSION}_linux_amd64.tar.gz" \
             | tar -xz -C "$HOME/.local/bin" actionlint
           echo "$HOME/.local/bin" >> "$GITHUB_PATH"