Migrating to Gitea CI

.gitea/workflows/clang-build.yml

@@ -5,6 +5,9 @@ jobs:
   clang-build:
     runs-on: ubuntu-latest
     steps:
+      - run: |
+        sudo apt update
+        sudo apt install -y git ca-certificates curl
       - uses: actions/checkout@v4
 
       - name: Install Clang

.gitea/workflows/gcc-build.yml

@@ -5,6 +5,9 @@ jobs:
   gcc-build:
     runs-on: ubuntu-latest
     steps:
+      - run: |
+        apt update
+        apt install -y git ca-certificates curl
       - uses: actions/checkout@v4
 
       - name: Build Datum