Add .git-sha256 fixture

Signed-off-by: Paulo Gomes <[email protected]>

Author: pjbgf

README.md

@@ -26,3 +26,27 @@ ls .git/objects/pack/
 	PackfileHash: "<PACK_HASH>",
 }
 ```
+
+### Adding new dot fixtures
+
+1. Tarball the contents of .git from a git repository:
+
+```sh
+git clone https://<repository>
+cd <repository_name>
+git checkout <REF>
+git gc
+
+tar -czf git.tgz -C .git .
+```
+
+2. Get the sha1 of the file: `shasum < git-.tgz`.
+3. Move the file using the checksum to `data/git-<checksum>.tgz`
+4. Add a new entry in `fixtures.go`:
+
+```
+{
+	Tags:         []string{"packfile", "<TAG_TO_REFER_TO>"},
+	PackfileHash: "<PACK_HASH>",
+}
+```

data/git-40143428b59fe03546fabba0603268bba3b3c58b.tgz

@@ -193,7 +193,12 @@ var fixtures = Fixtures{{
 }, {
 	Tags:         []string{"packfile", "notes"},
 	PackfileHash: "bc4b855a55cae7703c023d4e36e3a7c9f5d84491",
-}}
+}, {
+	Tags:       []string{".git-sha256"},
+	URL:        "https://gitlab.com/pjbgf/sha256.git",
+	DotGitHash: "40143428b59fe03546fabba0603268bba3b3c58b",
+},
+}
 
 func All() Fixtures {
 	all := make(Fixtures, 0, len(fixtures))