Enable Aarch64 CI
diff --git a/ci/build.gitlab-ci.yml b/ci/build.gitlab-ci.yml
index 3943bab..073212a 100644
--- a/ci/build.gitlab-ci.yml
+++ b/ci/build.gitlab-ci.yml
@@ -87,28 +87,28 @@
 
 ######## AArch64 ###############################################################
 # GCC-10
-# build:aarch64:linux:gcc-10:cxx11-on:
-#   extends: .build:linux:base
-#   variables:
-#     EIGEN_CI_CXX_COMPILER: "g++-10"
-#     EIGEN_CI_CC_COMPILER: "gcc-10"
-#     EIGEN_TEST_CXX11: "on"
-#   tags:
-#     - eigen-runner
-#     - linux
-#     - aarch64
+build:aarch64:linux:gcc-10:cxx11-on:
+  extends: .build:linux:base
+  variables:
+    EIGEN_CI_CXX_COMPILER: "g++-10"
+    EIGEN_CI_CC_COMPILER: "gcc-10"
+    EIGEN_TEST_CXX11: "on"
+  tags:
+    - eigen-runner
+    - linux
+    - aarch64
 
 # # Clang-10
-# build:aarch64:linux:clang-10:cxx11-on:
-#   extends: .build:linux:base
-#   variables:
-#     EIGEN_CI_CXX_COMPILER: "clang++-10"
-#     EIGEN_CI_CC_COMPILER: "clang-10"
-#     EIGEN_TEST_CXX11: "on"
-#   tags:
-#     - eigen-runner
-#     - linux
-#     - aarch64
+build:aarch64:linux:clang-10:cxx11-on:
+  extends: .build:linux:base
+  variables:
+    EIGEN_CI_CXX_COMPILER: "clang++-10"
+    EIGEN_CI_CC_COMPILER: "clang-10"
+    EIGEN_TEST_CXX11: "on"
+  tags:
+    - eigen-runner
+    - linux
+    - aarch64
 
 ######## ppc64le ###############################################################
 # Currently all ppc64le jobs are allowed to fail
diff --git a/ci/test.gitlab-ci.yml b/ci/test.gitlab-ci.yml
index 128c0da..63012bd 100644
--- a/ci/test.gitlab-ci.yml
+++ b/ci/test.gitlab-ci.yml
@@ -144,51 +144,51 @@
 
 ##### AArch64 ##################################################################
 # GCC-10
-# .test:aarch64:linux:gcc-10:cxx11-on:
-#   extends: .test:linux:base
-#   variables:
-#     EIGEN_CI_CXX_COMPILER: g++-10
-#     EIGEN_CI_CC_COMPILER: gcc-10
-#   needs: [ "build:aarch64:linux:gcc-10:cxx11-on" ]
-#   tags:
-#     - eigen-runner
-#     - linux
-#     - aarch64
+.test:aarch64:linux:gcc-10:cxx11-on:
+  extends: .test:linux:base
+  variables:
+    EIGEN_CI_CXX_COMPILER: g++-10
+    EIGEN_CI_CC_COMPILER: gcc-10
+  needs: [ "build:aarch64:linux:gcc-10:cxx11-on" ]
+  tags:
+    - eigen-runner
+    - linux
+    - aarch64
 
-# test:aarch64:linux:gcc-10:cxx11-on:official:
-#   extends: .test:aarch64:linux:gcc-10:cxx11-on
-#   allow_failure: true
-#   variables:
-#     EIGEN_CI_TEST_LABEL: "Official"
+test:aarch64:linux:gcc-10:cxx11-on:official:
+  extends: .test:aarch64:linux:gcc-10:cxx11-on
+  allow_failure: true
+  variables:
+    EIGEN_CI_TEST_LABEL: "Official"
 
-# test:aarch64:linux:gcc-10:cxx11-on:unsupported:
-#   extends: .test:aarch64:linux:gcc-10:cxx11-on
-#   allow_failure: true
-#   variables:
-#     EIGEN_CI_TEST_LABEL: "Unsupported"
+test:aarch64:linux:gcc-10:cxx11-on:unsupported:
+  extends: .test:aarch64:linux:gcc-10:cxx11-on
+  allow_failure: true
+  variables:
+    EIGEN_CI_TEST_LABEL: "Unsupported"
 
-# # Clang 10
-# .test:aarch64:linux:clang-10:cxx11-on:
-#   extends: .test:linux:base
-#   variables:
-#     EIGEN_CI_CXX_COMPILER: clang++-10
-#     EIGEN_CI_CC_COMPILER: clang-10
-#   needs: [ "build:aarch64:linux:clang-10:cxx11-on" ]
-#   tags:
-#     - eigen-runner
-#     - linux
-#     - aarch64
+# Clang 10
+.test:aarch64:linux:clang-10:cxx11-on:
+  extends: .test:linux:base
+  variables:
+    EIGEN_CI_CXX_COMPILER: clang++-10
+    EIGEN_CI_CC_COMPILER: clang-10
+  needs: [ "build:aarch64:linux:clang-10:cxx11-on" ]
+  tags:
+    - eigen-runner
+    - linux
+    - aarch64
 
-# test:aarch64:linux:clang-10:cxx11-on:official:
-#   extends: .test:aarch64:linux:clang-10:cxx11-on
-#   allow_failure: true
-#   variables:
-#     EIGEN_CI_TEST_LABEL: "Official"
+test:aarch64:linux:clang-10:cxx11-on:official:
+  extends: .test:aarch64:linux:clang-10:cxx11-on
+  allow_failure: true
+  variables:
+    EIGEN_CI_TEST_LABEL: "Official"
 
-# test:aarch64:linux:clang-10:cxx11-on:unsupported:
-#   extends: .test:aarch64:linux:clang-10:cxx11-on
-#   variables:
-#     EIGEN_CI_TEST_LABEL: "Unsupported"
+test:aarch64:linux:clang-10:cxx11-on:unsupported:
+  extends: .test:aarch64:linux:clang-10:cxx11-on
+  variables:
+    EIGEN_CI_TEST_LABEL: "Unsupported"
 
 ##### ppc64le ##################################################################
 # GCC-10