Use new Docker image (#2981)

.github/workflows/ubuntu.yml

@@ -11,20 +11,9 @@ on:
 jobs:
   ci_test_clang:
     runs-on: ubuntu-latest
+    container: ghcr.io/nlohmann/json-ci:v1.0.0
     steps:
       - uses: actions/checkout@v2
-      - name: install_ninja
-        run: |
-          sudo apt update
-          sudo apt install ninja-build
-        shell: bash
-      - name: install_clang
-        run: |
-          wget https://apt.llvm.org/llvm.sh
-          chmod +x llvm.sh
-          sudo ./llvm.sh 11
-          sudo apt-get install clang-tools-11
-        shell: bash
       - name: cmake
         run: cmake -S . -B build -DJSON_CI=On
       - name: build
@@ -32,7 +21,7 @@ jobs:
 
   ci_test_gcc:
     runs-on: ubuntu-latest
-    container: nlohmann/json-ci:latest
+    container: ghcr.io/nlohmann/json-ci:v1.0.0
     steps:
       - uses: actions/checkout@v2
       - name: cmake
@@ -42,7 +31,7 @@ jobs:
 
   ci_static_analysis:
     runs-on: ubuntu-latest
-    container: nlohmann/json-ci:latest
+    container: ghcr.io/nlohmann/json-ci:v1.0.0
     strategy:
       matrix:
         target: [ci_clang_tidy, ci_cppcheck, ci_test_valgrind, ci_test_clang_sanitizer, ci_test_amalgamation, ci_clang_analyze, ci_cpplint, ci_cmake_flags, ci_single_binaries, ci_reproducible_tests, ci_non_git_tests, ci_offline_testdata, ci_infer]
@@ -55,7 +44,7 @@ jobs:
 
   ci_cmake_options:
     runs-on: ubuntu-latest
-    container: nlohmann/json-ci:latest
+    container: ghcr.io/nlohmann/json-ci:v1.0.0
     strategy:
       matrix:
         target: [ci_test_diagnostics, ci_test_noexceptions, ci_test_noimplicitconversions]
@@ -68,7 +57,7 @@ jobs:
 
   ci_test_coverage:
     runs-on: ubuntu-latest
-    container: nlohmann/json-ci:latest
+    container: ghcr.io/nlohmann/json-ci:v1.0.0
     steps:
       - uses: actions/checkout@v2
       - name: cmake
@@ -88,7 +77,7 @@ jobs:
 
   ci_test_compilers:
     runs-on: ubuntu-latest
-    container: nlohmann/json-ci:latest
+    container: ghcr.io/nlohmann/json-ci:v1.0.0
     strategy:
       matrix:
         compiler: [g++-4.8, g++-4.9, g++-5, g++-7, g++-8, g++-9, g++-10, clang++-3.5, clang++-3.6, clang++-3.7, clang++-3.8, clang++-3.9, clang++-4.0, clang++-5.0, clang++-6.0, clang++-7, clang++-8, clang++-9, clang++-10, clang++-11]
@@ -101,7 +90,7 @@ jobs:
 
   ci_test_standards:
     runs-on: ubuntu-latest
-    container: nlohmann/json-ci:latest
+    container: ghcr.io/nlohmann/json-ci:v1.0.0
     strategy:
       matrix:
         standard: [11, 14, 17, 20]