Drop Java 11 and 17 from build (#376)

Author: rossabaker

.github/workflows/ci.yml

@@ -29,16 +29,7 @@ jobs:
       matrix:
         os: [ubuntu-latest]
         scala: [3.0.2, 2.12.15, 2.13.8]
-        java: [temurin@8, temurin@11, temurin@17]
-        exclude:
-          - scala: 3.0.2
-            java: temurin@11
-          - scala: 3.0.2
-            java: temurin@17
-          - scala: 2.12.15
-            java: temurin@11
-          - scala: 2.12.15
-            java: temurin@17
+        java: [temurin@8]
     runs-on: ${{ matrix.os }}
     steps:
       - name: Checkout current branch (full)
@@ -53,20 +44,6 @@ jobs:
           distribution: temurin
           java-version: 8
 
-      - name: Setup Java (temurin@11)
-        if: matrix.java == 'temurin@11'
-        uses: actions/setup-java@v2
-        with:
-          distribution: temurin
-          java-version: 11
-
-      - name: Setup Java (temurin@17)
-        if: matrix.java == 'temurin@17'
-        uses: actions/setup-java@v2
-        with:
-          distribution: temurin
-          java-version: 17
-
       - name: Cache sbt
         uses: actions/cache@v2
         with:
@@ -135,20 +112,6 @@ jobs:
           distribution: temurin
           java-version: 8
 
-      - name: Setup Java (temurin@11)
-        if: matrix.java == 'temurin@11'
-        uses: actions/setup-java@v2
-        with:
-          distribution: temurin
-          java-version: 11
-
-      - name: Setup Java (temurin@17)
-        if: matrix.java == 'temurin@17'
-        uses: actions/setup-java@v2
-        with:
-          distribution: temurin
-          java-version: 17
-
       - name: Cache sbt
         uses: actions/cache@v2
         with:

build.sbt

@@ -8,14 +8,15 @@ val Scala3 = "3.0.2"
 ThisBuild / crossScalaVersions := Seq(Scala3, Scala212, Scala213)
 ThisBuild / scalaVersion := crossScalaVersions.value.filter(_.startsWith("2.")).last
 ThisBuild / tlBaseVersion := "0.15"
-
 ThisBuild / tlVersionIntroduced := Map(
   "2.13" -> "0.14.5",
   "3" -> "0.15.0"
 )
-
 ThisBuild / tlFatalWarningsInCi := !tlIsScala3.value // See SSLStage
 
+// 11 and 17 blocked by https://github.com/http4s/blaze/issues/376
+ThisBuild / githubWorkflowJavaVersions := Seq(JavaSpec.temurin("8"))
+
 lazy val commonSettings = Seq(
   description := "NIO Framework for Scala",
   Test / scalacOptions ~= (_.filterNot(Set("-Ywarn-dead-code", "-Wdead-code"))), // because mockito