feat(ci)(cd): basic workflows

.github/workflows/ci.yaml

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+name: CI
+on:
+  pull_request:
+    paths:
+      - .github/workflows/ci.yaml
+      - build.sbt
+      - .scalafmt.conf
+      - project/**
+      - src/**
+
+defaults:
+  run:
+    shell: bash
+
+env:
+  GITHUB_TOKEN: ${{ secrets.READ_PACKAGES }}
+
+jobs:
+  code-check:
+    runs-on: self-hosted
+    container:
+      image: sbtscala/scala-sbt:eclipse-temurin-jammy-21.0.2_13_1.9.9_2.12.19
+      options: --user 1001:1001
+    steps:
+      - uses: actions/checkout@v4
+      - run: sbt headerCheckAll
+  test:
+    runs-on: self-hosted
+    container:
+      image: sbtscala/scala-sbt:eclipse-temurin-jammy-21.0.2_13_1.9.9_2.12.19
+      options: --user 1001:1001
+    steps:
+      - uses: actions/checkout@v4
+      - run: sbt clean test

.github/workflows/publish.yaml

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+name: publish
+on:
+  push:
+    tags:
+      - "v*.*.*"
+
+env:
+  GITHUB_TOKEN: ${{ secrets.WRITE_PACKAGES }}
+
+jobs:
+  publish:
+    runs-on: self-hosted
+    container:
+      image: sbtscala/scala-sbt:eclipse-temurin-jammy-21.0.2_13_1.9.9_2.12.19
+      options: --user 1001:1001
+    steps:
+    - uses: actions/checkout@v4
+      with:
+        fetch-depth: 0
+    - name: sbt publish
+      run: sbt clean publish

.scalafmt.conf

@@ -0,0 +1,136 @@
+version = 2.7.5
+maxColumn = 120
+
+optIn.forceBlankLineBeforeDocstring = true
+trailingCommas = "never"
+
+align {
+  openParenCallSite = false
+  openParenDefnSite = false
+  preset=some
+  stripMargin = false
+  tokens = []
+}
+
+assumeStandardLibraryStripMargin = true
+binPack.parentConstructors = "never"
+
+continuationIndent {
+  callSite = 2
+  ctorSite = 4
+  defnSite = 4
+  extendSite = 4
+}
+
+danglingParentheses {
+  ctrlSite = true
+  defnSite = true
+}
+
+
+docstrings.style = "Asterisk" // JavaDoc
+includeCurlyBraceInSelectChains = true
+includeNoParensInSelectChains = false
+
+literals {
+  double = "Lower"
+  float = "Lower"
+  hexDigits = "Lower"
+  hexPrefix = "Lower"
+  long = "Upper"
+}
+
+newlines {
+  afterCurlyLambdaParams = squash
+  afterCurlyLambdaParams=squash
+  alwaysBeforeElseAfterCurlyIf = false
+  beforeCurlyLambdaParams = multilineWithCaseOnly
+  beforeMultiline = fold
+  beforeMultilineDef = false
+  implicitParamListModifierPrefer = before
+}
+
+rewrite {
+  redundantBraces {
+    generalExpressions = false
+    ifElseExpressions = false
+    methodBodies = false
+    parensForOneLineApply = true
+    stringInterpolation = true
+  }
+  rules = [
+    RedundantBraces,
+    RedundantParens,
+    SortModifiers,
+    SortImports
+    ]
+  redundantBraces {
+    generalExpressions = false
+    methodBodies = false
+    ifElseExpressions = false
+    parensForOneLineApply = true
+    stringInterpolation = true
+  }
+  sortModifiers {
+    order = [ 
+      "implicit",
+      "final",
+      "sealed",
+      "abstract",
+      "override",
+      "private",
+      "protected",
+      "lazy"
+    ]
+  }
+}
+
+continuationIndent {
+  callSite = 2
+  defnSite = 4
+  ctorSite = 4
+  extendSite = 4
+}
+
+align {
+  preset=some
+  tokens = []
+  openParenCallSite = false
+  openParenDefnSite = false
+  preset = some
+  stripMargin = false
+  tokens = []
+}
+
+danglingParentheses {
+  defnSite = true
+  ctrlSite = true
+}
+
+spaces {
+  afterKeywordBeforeParen = true
+  afterSymbolicDefs = false
+  beforeContextBoundColon = "Never"
+  inByNameTypes = true
+  inParentheses = false
+  neverAroundInfixTypes = []
+  afterKeywordBeforeParen = true
+  inByNameTypes = true
+  afterSymbolicDefs = false
+}
+
+literals {
+  long = "Upper"
+  float = "Lower"
+  double = "Lower"
+  hexPrefix = "Lower"
+  hexDigits = "Lower"
+}
+
+docstrings {
+  style = "Asterisk" // JavaDoc
+}
+
+binPack {
+  parentConstructors = "Never"
+}