remove broken oracle-linux-8 (+ fedora) builders

.circleci/config.yml

@@ -48,8 +48,6 @@ dockerhub-auth-template: &DOCKERHUB_AUTH
         <<: *DOCKERHUB_CONTEXT
     - "build-image-fedora-35":
         <<: *DOCKERHUB_CONTEXT
-    - "build-image-oraclelinux-8":
-        <<: *DOCKERHUB_CONTEXT
     # Restore later as PyPy38
     #- "build-image-pypy27-buster":
     #    <<: *DOCKERHUB_CONTEXT
@@ -88,10 +86,6 @@ workflows:
       - "ubuntu-22-04":
           {}
 
-      # Equivalent to RHEL 8; CentOS 8 is dead.
-      - "oraclelinux-8":
-          {}
-
       - "nixos":
           name: "<<matrix.pythonVersion>>"
           nixpkgs: "nixpkgs-unstable"
@@ -540,37 +534,6 @@ jobs:
       <<: *UTF_8_ENVIRONMENT
       TAHOE_LAFS_TOX_ENVIRONMENT: "py310"
 
-  oraclelinux-8: &RHEL_DERIV
-    docker:
-      - <<: *DOCKERHUB_AUTH
-        image: "tahoelafsci/oraclelinux:8-py3.8"
-        user: "nobody"
-
-    environment:
-      <<: *UTF_8_ENVIRONMENT
-      TAHOE_LAFS_TOX_ENVIRONMENT: "py38"
-
-    # pip cannot install packages if the working directory is not readable.
-    # We want to run a lot of steps as nobody instead of as root.
-    working_directory: "/tmp/project"
-
-    steps:
-      - "checkout"
-      - run: *SETUP_VIRTUALENV
-      - run: *RUN_TESTS
-      - store_test_results: *STORE_TEST_RESULTS
-      - store_artifacts: *STORE_TEST_LOG
-      - store_artifacts: *STORE_ELIOT_LOG
-      - store_artifacts: *STORE_OTHER_ARTIFACTS
-      - run: *SUBMIT_COVERAGE
-
-  fedora-35:
-    <<: *RHEL_DERIV
-    docker:
-      - <<: *DOCKERHUB_AUTH
-        image: "tahoelafsci/fedora:35-py3"
-        user: "nobody"
-
   nixos:
     parameters:
       nixpkgs:
@@ -698,14 +661,6 @@ jobs:
       PYTHON_VERSION: "3.10"
 
 
-  build-image-oraclelinux-8:
-    <<: *BUILD_IMAGE
-
-    environment:
-      DISTRO: "oraclelinux"
-      TAG: "8"
-      PYTHON_VERSION: "3.8"
-
   build-image-fedora-35:
     <<: *BUILD_IMAGE