Workflows for validate and lint (KAT-Advanced-Medical#266)

* workflows

.editorconfig

@@ -0,0 +1,12 @@
+root = true
+
+[*]
+end_of_line = lf
+insert_final_newline = true
+charset = utf-8
+indent_style = space
+indent_size = 4
+trim_trailing_whitespace = true
+
+[*.md]
+trim_trailing_whitespace = false

.gitattributes

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+* text=auto
+*.png binary
+*.jpg binary
+*.paa binary
+
+# Change GitHub language categorization
+addons/**/*.cpp linguist-language=SQF
+addons/**/*.hpp linguist-language=SQF
+
+optionals/**/*.cpp linguist-language=SQF
+optionals/**/*.hpp linguist-language=SQF
+
+# Do not count hemtt includes in language usage stats
+include/* linguist-vendored

.github/workflows/arma.yml

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+name: Arma
+
+on:
+  push:
+    branches:
+    - master
+  pull_request:
+
+jobs:
+  validate:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout the source code
+      uses: actions/checkout@master
+    - name: Validate SQF
+      run: python3 tools/sqf_validator.py
+    - name: Validate Config
+      run: python3 tools/config_style_checker.py
+    - name: Validate Stringtables
+      run: python3 tools/stringtable_validator.py
+    - name: Check Strings
+      run: python3 tools/check_strings.py
+
+  lint:
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout the source code
+      uses: actions/checkout@master
+    - name: Lint (sqflint)
+      uses: arma-actions/sqflint@master
+      continue-on-error: true # No failure due to many false-positives