Add sqlfluff workflow

.github/workflows/sql_linting.yml

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+name: Lint Transformer Models
+
+on:
+  push:
+    branches:
+      - main
+      - 'transformers/**'
+
+jobs:
+  lint-models:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: "actions/checkout@v3"
+      - uses: "actions/setup-python@v3"
+        with:
+            python-version: "3.10.0"
+      - name: Install SQLFluff
+        run: "pip install sqlfluff"
+      - name: Lint models
+        run: "diff-quality --violations=sqlfluff --fail-under 100"

transformers/synthetix/.sqlfluff

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+[sqlfluff]
+dialect = postgres
+templater = jinja
+runaway_limit = 10
+max_line_length = 80
+indent_unit = space
+
+[sqlfluff:indentation]
+tab_space_size = 4
+
+[sqlfluff:layout:type:comma]
+spacing_before = touch
+line_position = trailing
+
+[sqlfluff:rules:capitalisation.keywords] 
+capitalisation_policy = lower
+
+[sqlfluff:rules:aliasing.table]
+aliasing = explicit
+
+[sqlfluff:rules:aliasing.column]
+aliasing = explicit
+
+[sqlfluff:rules:aliasing.expression]
+allow_scalar = False
+
+[sqlfluff:rules:capitalisation.identifiers]
+extended_capitalisation_policy = lower
+
+[sqlfluff:rules:capitalisation.functions]
+capitalisation_policy = lower
+
+[sqlfluff:rules:capitalisation.literals]
+capitalisation_policy = lower
+
+[sqlfluff:rules:ambiguous.column_references]  # Number in group by
+group_by_and_order_by_style = implicit

transformers/synthetix/.sqlfluffignore

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+target/
+dbt_modules/
+macros/
+templates/