Cleaner deployment process (fixes #2749) (#2750)

* TravisCI: cleaner deployment process.

* TravisCI: rename deployment script.

scripts/deploy.sh

@@ -0,0 +1,56 @@
+#!/usr/bin/env bash
+
+# This script is executed by Travis CI when a PR is merged (i.e. in the `deploy` step).
+set -ev
+
+function initialize {
+  if [ -z "$TLDRHOME" ]; then
+    export TLDRHOME=${TRAVIS_BUILD_DIR:-`pwd`}
+  fi
+  export TLDR_ARCHIVE="tldr.zip"
+  export SITE_HOME="$HOME/site"
+  export SITE_URL="github.com/tldr-pages/tldr-pages.github.io"
+  export SITE_REPO_SLUG="tldr-pages/tldr-pages.github.io"
+
+  # Configure git.
+  git config --global user.email "travis@travis-ci.org"
+  git config --global user.name "Travis CI"
+  git config --global push.default simple
+  git config --global diff.zip.textconv "unzip -c -a"
+
+  # Decrypt and add deploy key.
+  eval "$(ssh-agent -s)"
+  openssl aes-256-cbc -K $encrypted_973441be79af_key -iv $encrypted_973441be79af_iv -in ./scripts/id_ed25519_tldr_asset_upload.enc -out id_ed25519 -d
+  chmod 600 id_ed25519
+  ssh-add id_ed25519
+}
+
+function rebuild_index {
+  npm run build-index
+}
+
+function build_archive {
+  rm -f $TLDR_ARCHIVE
+  cd $TLDRHOME/
+  zip -r $TLDR_ARCHIVE pages*/ LICENSE.md
+}
+
+function upload_assets {
+  git clone --quiet --depth 1 git@github.com:${SITE_REPO_SLUG}.git $SITE_HOME
+  mv -f $TLDR_ARCHIVE $SITE_HOME/assets/
+  cp -f $TLDRHOME/pages/index.json $SITE_HOME/assets/
+
+  cd $SITE_HOME
+  git add -A
+  git commit -m "[TravisCI] uploaded assets after commits ${TRAVIS_COMMIT_RANGE}"
+  git push -q
+}
+
+###################################
+# MAIN
+###################################
+
+initialize
+rebuild_index && echo "Rebuilding index done."
+build_archive && echo "Pages archive created."
+upload_assets && echo "Assets (pages archive, index) deployed to static site."