Use ubuntu-22.04, add erlang:26 container as that ubuntu doesn't include it

.github/workflows/ci.yml

@@ -10,7 +10,7 @@ jobs:
       fail-fast: false
       matrix:
         otp: ['19.3', '25.3', 26, 27]
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
     container:
       image: erlang:${{ matrix.otp }}
     steps:
@@ -23,7 +23,9 @@ jobs:
   cover:
     name: Cover
     needs: [tests]
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
+    container:
+      image: erlang:26
     steps:
     - uses: actions/checkout@v2
     - run: ./configure --enable-gcov

.github/workflows/hexpm-release.yml

@@ -7,7 +7,9 @@ on:
 
 jobs:
   release:
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-22.04
+    container:
+      image: erlang:26
     steps:
       - name: Check out
         uses: actions/checkout@v2