Use ad-hoc docker image for testing git-1.7.2

Author: strk

.drone.yml

@@ -10,32 +10,25 @@ clone:
     tags: true
 
 pipeline:
-  testing:
+  testing-git-latest:
     image: webhippie/golang:edge
     pull: true
     commands:
       - git update-ref refs/heads/test HEAD
       - make clean
       - make vet
       - make lint
-      # Test with latest git version
       - git --version && make test
-      # Test with git version 1.7.2
-      - apk add --update autoconf zlib-dev > /dev/null &&
-        mkdir build &&
-        curl -sL "https://github.com/git/git/archive/v1.7.2.tar.gz" -o git.tar.gz &&
-        tar -C build -xzf git.tar.gz &&
-        cd build/git-1.7.2 &&
-        { autoconf 2> err || { cat err && false; } } &&
-        ./configure --without-tcltk --prefix=/usr/local > /dev/null &&
-        { make install NO_PERL=please > /dev/null 2> err || { cat err && false; } } &&
-        cd ../.. &&
-        rm -rf build git.tar.gz &&
-        hash -r &&
-        git --version &&
-        make test
-      # Test a build (is this really needed?)
       - make build
+  testing-git-1.7:
+    image: docker.kbt.io/gitea-git-ci:1.7
+    pull: true
+    commands:
+      - git update-ref refs/heads/test HEAD
+      - make clean
+      - make vet
+      - make lint
+      - PATH=/opt/git-1.7.2/bin git --version && make test
 
   # coverage:
   #   image: plugins/coverage:1