refactoring: combine merge lib.sh to entrypoint.sh

If we use "source /lib.sh", bash will point to wrong line in case of an error.
It's confusing on debuggin new features

entrypoint.sh

@@ -2,21 +2,71 @@
 
 set -eu
 
-source /lib.sh
+_main() {
+    _switch_to_repository
 
-_switch_to_repository
+    if _git_is_dirty; then
 
-if _git_is_dirty; then
+        _setup_git
 
-    _setup_git
+        _switch_to_branch
 
-    _switch_to_branch
+        _add_files
 
-    _add_files
+        _local_commit
 
-    _local_commit
+        _push_to_github
+    else
+        echo "Working tree clean. Nothing to commit."
+    fi
+}
 
-    _push_to_github
-else
-    echo "Working tree clean. Nothing to commit."
-fi
+
+_switch_to_repository() {
+    echo "INPUT_REPOSITORY value: $INPUT_REPOSITORY";
+    cd $INPUT_REPOSITORY
+}
+
+_git_is_dirty() {
+    [[ -n "$(git status -s)" ]]
+}
+
+# Set up .netrc file with GitHub credentials
+_setup_git ( ) {
+  cat <<- EOF > $HOME/.netrc
+        machine github.com
+        login $GITHUB_ACTOR
+        password $GITHUB_TOKEN
+
+        machine api.github.com
+        login $GITHUB_ACTOR
+        password $GITHUB_TOKEN
+EOF
+    chmod 600 $HOME/.netrc
+
+    git config --global user.email "actions@github.com"
+    git config --global user.name "GitHub Actions"
+}
+
+_switch_to_branch() {
+    echo "INPUT_BRANCH value: $INPUT_BRANCH";
+
+    # Switch to branch from current Workflow run
+    git checkout $INPUT_BRANCH
+}
+
+_add_files() {
+    echo "INPUT_FILE_PATTERN: ${INPUT_FILE_PATTERN}"
+    git add "${INPUT_FILE_PATTERN}"
+}
+
+_local_commit() {
+    echo "INPUT_COMMIT_OPTIONS: ${INPUT_COMMIT_OPTIONS}"
+    git commit -m "$INPUT_COMMIT_MESSAGE" --author="$GITHUB_ACTOR <$GITHUB_ACTOR@users.noreply.github.com>" ${INPUT_COMMIT_OPTIONS:+"$INPUT_COMMIT_OPTIONS"}
+}
+
+_push_to_github() {
+    git push --set-upstream origin "HEAD:$INPUT_BRANCH"
+}
+
+_main

lib.sh

@@ -1,48 +0,0 @@
-#!/bin/bash
-
-_switch_to_repository() {
-    echo "INPUT_REPOSITORY value: $INPUT_REPOSITORY";
-    cd $INPUT_REPOSITORY
-}
-
-_git_is_dirty() {
-    [[ -n "$(git status -s)" ]]
-}
-
-# Set up .netrc file with GitHub credentials
-_setup_git ( ) {
-  cat <<- EOF > $HOME/.netrc
-        machine github.com
-        login $GITHUB_ACTOR
-        password $GITHUB_TOKEN
-
-        machine api.github.com
-        login $GITHUB_ACTOR
-        password $GITHUB_TOKEN
-EOF
-    chmod 600 $HOME/.netrc
-
-    git config --global user.email "actions@github.com"
-    git config --global user.name "GitHub Actions"
-}
-
-_switch_to_branch() {
-    echo "INPUT_BRANCH value: $INPUT_BRANCH";
-
-    # Switch to branch from current Workflow run
-    git checkout $INPUT_BRANCH
-}
-
-_add_files() {
-    echo "INPUT_FILE_PATTERN: ${INPUT_FILE_PATTERN}"
-    git add "${INPUT_FILE_PATTERN}"
-}
-
-_local_commit() {
-    echo "INPUT_COMMIT_OPTIONS: ${INPUT_COMMIT_OPTIONS}"
-    git commit -m "$INPUT_COMMIT_MESSAGE" --author="$GITHUB_ACTOR <$GITHUB_ACTOR@users.noreply.github.com>" ${INPUT_COMMIT_OPTIONS:+"$INPUT_COMMIT_OPTIONS"}
-}
-
-_push_to_github() {
-    git push --set-upstream origin "HEAD:$INPUT_BRANCH"
-}