Add shfmt for consistent formatting rules

.editorconfig

@@ -0,0 +1,13 @@
+root                 = true
+[*]
+indent_style         = space
+indent_size          = 2
+shell_variant        = bash
+binary_next_line     = true
+switch_case_indent   = true
+space_redirects      = true
+keep_padding         = true
+function_next_line   = false
+end_of_line          = lf
+insert_final_newline = true
+trim_trailing_whitespace = true

.github/workflows/ci.yml

@@ -1,3 +1,5 @@
+name: "Linting & Formatting"
+
 on:
   - push
   - pull_request
@@ -6,7 +8,14 @@ jobs:
   lint:
     runs-on: ubuntu-latest
     steps:
-      - uses: actions/checkout@v4
-      - uses: ludeeus/action-shellcheck@master
+      - name: "Checkout"
+        uses: actions/checkout@v4
+
+      - name: "Lint check"
+        uses: ludeeus/action-shellcheck@master
         env:
           SHELLCHECK_OPTS: -x
+      - name: "Format check"
+        run: |
+          curl -sS https://webi.sh/shfmt | sh
+          shfmt -l -d .

Brewfile

@@ -4,4 +4,5 @@ brew "yq"
 brew "coreutils"
 brew "oath-toolkit"
 brew "gnupg"
+brew "shfmt"
 cask "session-manager-plugin"