feat(federation): add scenario-mastodon setup and teardown (#1274)

2/5 taken out of #1269

This patch adds the setup and teardown of Mastodon for use in the end-to-end tests

Co-Authored-By: zam <mirco.zachmann@meissa.de>
Co-Authored-By: erik <erik.seiert@meissa-gmbh.de>
Co-Authored-By: Michael Jerger <michael.jerger@meissa-gmbh.de>

Reviewed-on: https://code.forgejo.org/forgejo/end-to-end/pulls/1274
Reviewed-by: earl-warren <earl-warren@noreply.code.forgejo.org>
Reviewed-by: Beowulf <beowulf@noreply.code.forgejo.org>
Co-authored-by: famfo <famfo@famfo.xyz>
Co-committed-by: famfo <famfo@famfo.xyz>

federation/scenario-mastodon/functions.sh

@@ -0,0 +1,32 @@
+function generate_certs() {
+
+    host=${1}
+    cert_location=${2}
+
+    rootCertificate="${cert_location}/custom-snakeoil-rootCA.crt"
+    rootCertKey="${cert_location}/custom-snakeoil-rootCA.key"
+    extensionFile="${cert_location}/${host}-snakeoil.ext"
+    keyFile="${cert_location}/${host}-snakeoil.key"
+    csrFile="${cert_location}/${host}-snakeoil.csr"
+    crtAltSubFile="${cert_location}/${host}-snakeoil.crt"
+
+    cat << EOF > ${extensionFile}
+authorityKeyIdentifier=keyid,issuer
+basicConstraints=CA:FALSE
+subjectAltName = @alt_names
+[alt_names]
+DNS.1 = ${host}
+DNS.2 = localhost
+EOF
+
+    # Create CSR
+    openssl req -newkey rsa:2048 -nodes -keyout ${keyFile} \
+        -out ${csrFile} -subj "/CN=${host}" -addext "subjectAltName=DNS:localhost"
+
+    # Sign Our CSR with the root CA cert
+    openssl x509 -req -CA ${rootCertificate} \
+        -CAkey ${rootCertKey} \
+        -in ${csrFile} \
+        -out ${crtAltSubFile} \
+        -days 3650 -CAcreateserial -extfile ${extensionFile}
+}